Note: This article is updated constantly. Last update: 8 December 2022.
Introduction
With every passing year, more red dot sights are available on the market. There have never been as many optics manufacturers as there are now, which means that there have never been as many different optical devices as there are now.
- Introduction
- Terminology
- Docter/Noblex mounting standard
- Aimpoint Micro mounting standard
- C-more RTS/STS mounting standard
- Shield RMS/SMS mounting standard
- Trijicon RMR mounting standard
- Trijicon MRO mounting standard
- Glock MOS mounting standard
- Aimpoint Acro mounting standard
- Aimpoint CompM4 mounting standard
- C-More Railway mounting standard
- Holosun AEMS mounting standard
- Red dot sights that have a unique mounting standard
- A list of all the red dot sights, their mounting standards and footprints
- Adapter plates
Red dot sights have been steadily gaining in popularity – for this reason, they can be found in the offer of most manufacturers of optics around the world. Even companies such as Kahles and Leica, who haven’t manufactured red dot sights before, have recently launched their own versions.
Click here to see all footprints of red dot sights in our database
Terminology
When this article was first written, there was some inconsistency in the use of terminology. This is why we decided to dedicate this paragraph to explaining the differences between the terms screw hole pattern, bolt pattern, socket pattern, mounting standard, and footprint.
Screw hole pattern
The screw hole pattern refers to the screw hole (bolt) position on a red dot sight.
Bolt pattern
This is just another term used to refer to the screw hole pattern.
Socket pattern
The socket pattern refers to the dimensions and distances between the sockets on the red dot sight's mounting surface.
Mounting standard
The screw hole pattern (bolt pattern) and the socket pattern form a mounting standard. Red dot sights that share a mounting standard can be mounted on the same adapter.
With Aimpoint Acro, Holosun 509T, and some other standards, there are neither screw holes nor any sockets on the mounting surface. When using the term 'mounting standard' to talk about these sights, we refer to the dimensions of the clamping mechanism on the red dot sight's mounting surface.
Footprint
The term footprint encompasses the mounting standard and the entire bottom surface of the red dot sight. To give you a better understanding, if the mounting surface was pressed into the sand, the three-dimensional imprint would show (match) the footprint of the device.
Differentiating between these terms is important, especially if you have a custom pistol slide cut. In that case, you want the red dot sight to sit in the cutout perfectly, so taking only the mounting standard into account is not enough; you want a red dot sight whose footprint matches the cutout perfectly.
In this article, the most common mounting standards used on red dot sights are listed. Each standard is described and an image of it is added. Within each mounting standard section, the red dot sights that share it are enumerated. Next to each sight, there is a link to the dimensions of its footprint (we will gradually be adding these).
Docter/Noblex mounting standard
This is one of the most widely used mounting standards in the field of red dot sights. It has two holes for screws and four sockets in which the pins on the mount/adapter fit, one in each corner. There is a wide range of mounts for this mounting standard on the market, which is one of the main reasons why it is used by so many manufacturers. Docter/Noblex standard is simple and reliable.
Red dot sights that share this mounting standard:
- ADE Advanced Optics RD3-002
- ADE Advanced Optics RD3-006A Huracan
- ADE Advanced Optics RD3-006B Huracan
- ADE Advanced Optics RD3-009 Crusader
- ADE Advanced Optics RD3-012 Delta
- ADE Advanced Optics RD3-013 Bertrillium
- Athlon Midas TSR1
- Burris Fastfire 2*
- Burris Fastfire 3*
- Burris Fastfire 4
- Delta Optical MiniDot*
- Delta Optical MiniDot II*
- Docter Sight C
- Docter Sight II Plus
- Docter Sight III
- Docter QUICKsight 5.0 VR
- Hawke Reflex 1x25*
- Hex Dragonfly
- Leica Tempus
- MAKdot 1x25
- Makdot SH
- Meopta Meosight IV
- Noblex Sight C
- Noblex Sight 2 Plus
- Noblex Sight III
- Noblex Sight G
- Noblex QUICKsight 5.0 VR
- Primary Arms SLx RS-10**
- Sightmark Mini Shot M-Spec
- Sightmark Mini Shot Pro Spec*
- US Optics DRS 2.0*
- US Optics DRS 2.0 Enhanced*
- UTG OP3 Micro
- Vector Optics Frenzy 1x17x24
- Vector Optics Frenzy 1x20x28*
- Vomz Pilad 1x20
- Vortex Viper
- Vortex Venom
* These red dot sights have a Docter/Noblex mounting standard, but the adapter supplied with them has wider threaded sockets than adapters suited for a Docter/Noblex mounting standard. Consequently, thicker screws are enclosed. You can mount these red dots on an adapter designed specifically for the Docter/Noblex mounting standard, but you will not be able to use the screws supplied with them – thinner screws are needed.
**The screw holes do not accept a 6-32 screw.
Note: distances between holes (sockets) are measured from and to the center of the hole (socket).
Modifications of the Docter/Noblex mounting standard
The following red dot sights come with a mounting surface that is very similar to the one used by Docter:
The four sockets, one in each corner, are in the exact same places. The holes for the screws, however, are not. This is why Meopta Meosight III, Delta Optical MiniDot HD 25, and Meprolight MicroRDS cannot be mounted on every adapter designed for the Docter/Noblex mounting standard. Several adapters are designed so that red dot sights with a Docter/Noblex mounting standard and Meopta Meosight III/Delta Optical MiniDot HD 25/Meprolight MicroRDS can be mounted on them (see the images below).
Aimpoint Micro mounting standard
Aimpoint is the first company to have used this mounting standard on their Micro small tube sights. Today, other manufacturers of this type of sights use it as well. The surface of the mounting surface is slightly lifted in the middle – on each side of the lifted section, there are two holes for screws. The lifted section is cut in the middle – this is where the recoil stop fits.
Red dot sights that share this mounting standard:
- Actus Core-1 1x20
- Actus Core-2 1x20
- Aimpoint CompM5
- Aimpoint Duty RDS
- Aimpoint CompM5b
- Aimpoint Micro H-1
- Aimpoint Micro H-2
- Aimpoint Micro T-1
- Aimpoint Micro T-2
- Athlon Midas TSR2
- Blaser RD 17
- Burris Fastfire RD
- DI Optical SP1
- Holosun 403 models
- Holosun 503 models
- Holosun 515 models
- Holosun 530 models
- Kahles Helia RD-C
- MAKdot S 1x20
- Minox RV1
- Primary Arms SLX Advanced Rotary Knob
- Primary Arms SLX MD-20
- Sightmark Element Mini Solar
- Sightmark Wolverine 1x23 CSR
- Sightmark Wolverine 1x28 FSR
- Sig Sauer Romeo4
- Sig Sauer Romeo5
- Sig Sauer Romeo-MSR
- Swampfox Liberator 1x22
- Vector Optics Centurion 1x20
- Vector Optics Maverick 1x22
- Vector Optics Maverick 1x22 Gen II
- Vector Optics Scrapper 1x22
- Vector Optics Scrapper 1x25
- Vortex Crossfire
- Vortex Sparc AR
- Vortex Sparc Solar
- ZeroTech Thrive
Modifications of the Aimpoint Micro mounting standard
Red dot sights that feature a modified Aimpoint Micro mounting standard:
- GPO Spectra
- Hawke Endurance 1x25
- Hawke Endurance 1x30
- Rudolph Optics 1x20
- Vector Optics Maverick-IV 1x20 Mini
- ADE Advanced Optics RD4-005
GPO Spectra uses a mounting surface that is identical to the one used by Aimpoint Micro. Even though it appears to be the same at first sight, there is a protruding part underneath the illumination knob. Because of it, the adapters designed for the Aimpoint Micro mounting standard do not fit into place at that side (check the picture below). GPO Spectra uses a unique adapter with narrow side sections.
Hawke Endurance 1x25 and 1x30 red dot sights also use a mounting surface slightly different from the Aimpoint Micro one. The lifted section in the middle is wider, thus adapters designed for the Aimpoint Micro mounting surface do not fit in place.
This red dot sight features a modified Aimpoint Micro mounting standard – the recoil notch in the middle of its footprint is missing. Nearly all mounts designed for the Aimpoint Micro mounting standard come with a recoil stopper in the middle, which is why it is nearly impossible to find an aftermarket adapter made by a renowned mounts manufacturer for Rudolph Optics 1x20.
Vector Optics Maverick-IV 1x20 Mini
This red dot sight features a modified Aimpoint Micro mounting standard. The distance between the two screw holes on each side of the recoil stopper is 8.8 mm instead of 10 mm. Because of this, Vector Optics Maverick IV 1x20 Mini is not compatible with adapters designed for the Aimpoint Micro mounting standard.
This red dot has a modified Aimpoint Micro mounting standard. The recoil notch in the middle of its mounting standard is narrower, measuring the same as a Weaver recoil notch, 3.8 mm. Furthermore, the distance between the screw holes in the front and in the rear is 2 millimeters bigger than on Aimpoint Micro mounting standard.
C-more RTS/STS mounting standard
This is a mounting standard found on C-more’s popular red dot sights, RTS and STS. Some other manufacturers also use it because of its simplicity and reliability. The standard consists of two holes for screws and two sockets in which the pins on the mount/adapter fit.
Red dot sights that share this mounting standard:
- C-more STS
- C-more STS 2
- C-more RTS
- C-more RTS 2
- Delta Optical MiniDot HD 24
- Delta Optical MiniDot HD 26
- Delta Optical Stryker
- FTP Optics Alpha 3
- Kahles Helia RD
- Kite Optics K1
- Sig Sauer Romeo3 1x25
- Sig Sauer Romeo3 Max 1x30
- Sig Sauer Romeo3 XL 1x35
- Vector Optics Frenzy 1x26x32
- Vortex Razor
Shield RMS/SMS mounting standard
Shield sights are incredibly compact, which is why Shield had to come up with a mounting standard of their own. It is designed similarly to the Noblex/Docter mounting standard (there are two holes for the screws and four sockets in which the notches on the mount/adapter fit, one in each corner). The sockets, however, are a little bit wider and closer one to another.
Red dot sights that share this mounting standard:
- ADE Advanced Optics RD3-018 Spike
- ADE Advanced Optics RD3-021 Nuwa
- JP Enterprises JPoint
- Leupold Delta Point Pro
- Shield RMS
- Shield RMSc
- Shield RMSw
- Shield SMS
- Shield SMSc
- Shield RMSx
- Shield SMS 2.0
- Sightmark Mini Shot A-Spec M3
- Sig Sauer Romeo Zero
- Swampfox Sentinel 1x16
- UTG OP3 Mini Micro
- Vector Optics FrenzyS 1x16x22
- Vector Optics Frenzy-S 1x17x24 MIC
Important notes
Even though Shield RMS and RMSc differ in dimensions (the 'c' version is smaller), the distances between the holes are the same, which is why an adapter designed for the Shield mounting standard fits on both.
- RMSc -(length x width x height) 40 x 23 x 22 mm
- MS - (length x width x height) 42 x 25 x 23 mm
Modifications of the Shield RMS/SMS mounting standard
These red dot sights feature a modification of the Shield standard:
- Holosun 407K
- Holosun 507K
- Holosun 407K X2
- Holosun 507K X2
The differences are:
- the two rear sockets are missing (see the photo below)
- the sockets in the front are shallower (see the photo below)
For this reason, some pistols that are optic ready for the Shield mounting standard need to be modified for the 407 and 507K. Namely, the two rear indexing lugs on the pistol have to be removed and the two front indexing lugs shortened in height. Hellcat and Walther PPS are examples of such pistols (some pistols, such as Sig Sauer P365XL, do not have to be modified).
Trijicon RMR mounting standard
This mounting standard consists of two holes for screws and two sockets in which the pins on the mount/adapter fit – these are in the front, in each corner. Even though the sockets are in the front only, the mounting standard is somewhat reminiscent of the Docter/Noblex one. Note, however, that the sockets in the corners are farther apart on the Trijicon mounting standard and bigger in diameter.
Red dot sights that share this mounting standard:
- Trijicon RMR
- Trijicon SRO
- Holosun 407C
- Holosun 407C V2
- Holosun 407C X2
- Holosun 507C
- Holosun 507C V2
- Holosun 507C X2
- Holosun 508T
- Holosun 508T X2
- Riton X3 Tactix PRD
- NcStar VISM FlipDot Pro
- ADE Advanced Optics RD3-020 Raptor
- ADE Advanced Optics RD3-023 Valkyrie
- Swampox Kingslayer 1x22
- Swampfox Liberty RMR 1x22
- Swampfox Justice RMR 1x27
- Vector Optics Frenzy 1x22x26
Modifications of the Trijicon RMR mounting standard
Red dot sights that feature a modified Aimpoint Micro mounting standard:
This red dot sight has two additional sockets on its mounting surface. They are located in each of the rear corners. Furthermore, the sockets are 0,1 mm narrower and the screw holes are 0,4 mm wider than on the standard RMR mounting standard. Nevertheless, mounts designed for the Trijicon RMR mounting standard can be mounted on ADE Advanced Optics RD3-019 Stingray.
Trijicon MRO mounting standard
This mounting standard comprises four screw holes, two in the front, two in the rear. The holes on the left are separated from the holes on the right with a lifted section in the middle.
Red dot sights that share this mounting standard:
Important notes (Burris RT-1X)
Burris RT-1X's mounting standard is the same as the one on Trijicon MRO, but there is a difference in the supplied screws. RT-1X comes with screws that have bigger heads than the ones supplied with the MRO, which is why you cannot use them to fix an original Trijicon adapter on the Burris red dot. If you wish to mount an original Trijicon adapter on the Burris RT-1X, you have to use the screws supplied with the Trijicon adapter (see the picture below).
Modifications of the Trijicon MRO mounting standard
Vector Optics Centurion 1x30 features a modification of the Trijicon MRO mounting standard. The distances between the screw holes are the same, and so is the thread. The difference is in the lifted section. On Centurion, the middle part of the lifted section is cut out to create space for a recoil stop. For this reason, a mount designed for the Trijicon MRO mounting standard fits on the Centurion, while a mount designed for the Vector Optics Centurion (with a recoil stop) does not fit on the MRO (the middle part of the lifted section is not cut out).
Glock MOS mounting standard
Glock devised the MOS system in 2015. MOS stands for Modular Optic System. This was one of the first optic-ready sistems introduced on a pistol, and the standard has been gaining in popularity ever since. There are two screw holes between the front and the middle part of the mounting surface. Usually, a plate is used to convert the MOS standard to any other ones, but some red dot sights are designed to fit directly on it.
Red dot sights that share this mounting standard:
- Holosun SCS MOS
- Noblex Red Dot Sight for Glock MOS
Aimpoint Acro mounting standard
Aimpoint designed a new mounting standard for their Acro red dot sights. There are grooves on the side of it with a movable part used to fix the red dot sight in place. The movable part is connected to a recoil stopper. The system is similar (but not the same) as the one designed for a Picatinny rail.
Red dot sights that share this mounting standard:
Note: distances between holes (sockets) are measured from and to the center of the hole (socket).
Steiner MPS features the same mounting standard as Aimpoint ACRO but its footprint is slightly different. The grooves in which the adapter fit are not in the exact same place but the recoil notch is. This is why adapters designed for Aimpoint Acro can be mounted on MPS as well.
Aimpoint CompM4 mounting standard
The screw holes, one on each side of the mounting standard, are located on the lifted sections which work as recoil stoppers when fixed on an adapter. The same applies to the lifted section in the middle.
Red dot sights that share this mounting standard:
C-More Railway mounting standard
This is one of the longest mounting surfaces available in red dot sights. There are two screw holes on it for mounting purposes. The mounting surface is flat.
Red dot sights that share this mounting standard:
Modification of the C-more Railway mounting standard
The following red dot sight uses the same form factor but the mounting solution is completely different.
The dot is attached to the pistol by means of drilling and tapping the frame via the integral polymer mount.
C-MORE SERENDIPITY INSTALLATION
The Serendipity was originally designed to attach to 1911 style handguns for competition shooting by drilling and tapping the frame and mounting the sight directly via the integral mount.
The mounting legs allow for a maximum slide width of .950" (A).
The mounting legs allow for a maximum slide height of 1" (B).
The mounting pads can be machined to accomodate frame widths between .750" and 1" (C).
Holosun AEMS mounting standard
Holosun introduced this mounting standard in 2022 on AEMS and AEMS Core models. There are two sockets in the front part, a screw hole next to each of these sockets, and two more screw holes close to the central part of the surface. There is a recoil stop between the screw holes.
Red dot sights that have a unique mounting standard
Trijicon RMRcc has a mounting surface without recoil-stopping sockets. There are two holes for screws between the middle and rear section. The size of the mounting standard is similar to Shield RMS/SMS, Leupold Delta Point Pro, Holosun 407/507K, etc.
This red dot sight has a unique mounting surface that works similarly to the mounting standard designed for the Picatinny rail. The adapters suitable for it are slid into place and then fixed with the movable side section. A recoil stop helps keep the adapter in place.
The mounting surface of the Infinity models is flat, with three notches for recoil stoppers. The adapter is fixed in place with four screws.
Sig Sauer’s Romeo 1 1x30 has a mounting standard suitable for mounting on certain Sig Sauer pistols – you will need a special adapter if you wish to mount it elsewhere.
- Steiner MRS
- Steiner MRS Universal
All Steiner MRS red dot sights share the same mounting standard – there are only two narrow notches in the front, while the holes for the screws are located at the rear of the sight, on both sides, left and right.
The 'Universal' model, however, is supplied with an adapter that converts the mounting standard into the one designed for Docter/Noblex adapters.
- Holosun Paralow 403A
Holosun 510C has 10 screw holes on its mounting surface, 6 in the front and 4 in the rear. There are two lifted sections in the middle which work as recoil stoppers.
Even though the mounting standard found on Vector Optics Nautilus 1x30 looks identical to the one on DI Optical RV2, there are minimal differences between the two. The lifted sections with screw holes are narrower on RV2. Because of some other minimal deviations, the supplied adapters are not interchangeable between these two sights.
The mounting standard on Sightmark Volta is somewhat similar to the Aimpoint Micro mounting standard, but the distance between the front and rear holes is bigger. Furthermore, the recoil notch is wider.
The mounting standard on Vector Optics Wraith 1x22x33 is an enlarged version of the Docter/Noblex mounting standard. There is a socket in each of the four corners and two screw holes in the rear part of the surface.
This mounting standard is similar to the one on Vector Optics Wraith, but the distances between the sockets and the screw holes are not exactly the same. There are four sockets, one in each corner, and two screw holes in the rear part of the surface for mounting purposes.
If you have a compact reflex or small tube sight that isn’t listed in this article, please be so kind as to send a picture of the sight and its footprint to andraz.gradisnik@optics-trade.eu – help us expand our database. We greatly appreciate everyone’s help!
This article is regularly updated with new information and user contributions. We aim to create a collection of useful data that will be of great help to users, potential buyers of red dot sights, and those who are looking for a specific mount/adapter for their red dot sight.
A list of all the red dot sights, their mounting standards and footprints
Adapter plates
An adapter plate is needed if you wish to mount a red dot sight on your handgun. As there are red dot sights with different mounting standards on the market, it is important to pick the suitable one. Some handguns are optic-ready and come with a mounting standard-specific plate. In the following link, you will find a vast selection of red dot sight plates that either fit directly on a specific handgun or convert the existing mounting standard to make it compatible with another mounting standard:
is an optics enthusiast who writes articles and reviews in the field of binoculars, riflescopes, NV optics etc. Currently, he is a member of the Optics Trade team.
Amazing resource!
I have an RMR pattern 6 second mount. I am trying to see if there is a way I could attach a MICRO footprint optic on it. I have found a RMR to Docter plate and a Docter to MICRO plate, but would you know of any better mounting solutions?
Thank you!
by MICRO are you referring to the Aimpoint Micro mounting standard? If so, I do not know of any converters from RMR to Aimpoint Micro, at least we do not offer any in our online store (yet) https://www.optics-trade.eu/en/.
Absolutely PERFECT resource for those trying to make an RDS/mount buying decision, without having to spend HOURS reading half-baked & half-informed articles on the web.
I currently have a trijicon rmr on a walther pdp and was thinking about converting over to a holosun. Do you happen to know if I can use the rmr mounting screws or do I need new ones and what length they would be?
Are you referring to the Holosun 407C and 507C models? These have the same mounting standard as the Trijicon RMR, yes. Trijicon RMR comes with longer screws than 407/507C models but I've used the screws supplied with Trijicon RMR to mount 407C and 507C red dot sights on adapters designed for the RMR mounting standard on many occasions. Not sure if it works on a Walther PDP, though.
Hello,
I am newer to the optics mounted red dots, having only 2 at this time, both of which had lugs that went into corresponding holes in the site to help secure the optic. I recently purchased a B&T mkII which has the Shield RMS footprint and am looking for an optic to direct mount to the slide. The only version I could find at LGS had no lugs at all and would only secure by the two screws. What am I missing, shouldn't at least two lugs be used plus the screws? Any help would be appreciated
Were you looking at Trijicon RMRcc? This red dot lacks mounting sockets, it only comes with two screw holes:
https://www.optics-trade.eu/blog/trijicon-rmrcc-footprint/
It is not compatible with the Shield mounting standard.
I suggest that you check the list on the following link and find the dot with the dimensions that suit your B&T's slide.
https://optics-info.com/footprints-on-red-dot-sights/#shieldstandard
Not exactly. I have a Riton MPRD with a Shield Footprint but no lugs are protruding from either the slide or the sight. Both the sight and slide have recesses for lugs, I would have thought at least one should have lugs for proper engagement assuming two screws alone to secure the sight were not efficient. What am I missing?
Thanks
Interesting, to be honest, I haven't had the opportunity to see Riton MPRD yet. On their website they claim that it is a Shield footprint, but based on the description of yours, it think it might be an error. Could you send a photo of the footprint to andraz.gradisnik@optics-trade.eu?
Sorry, a lot of the information you have on here is useful. I am just frustrated at the dearth of useful info in database-type formats.
What I am looking for EXACTLY is a green dot sight, less than one inch wide, for a pistol. In my mind I should be able to simply look at all of the dot sights available, select "green reticle" and "width less than an inch" as narrowing criteria, and get a list of results.
As it stands, no one has anything like this, so I am stuck. I can't even find a website that lets me narrow down dot sights to green-only reticles. It is extremely frustrating.
Yes, most online stores do not have filtering options that include dimensions. The only green dot sight that comes to my mind is Holosun 507K-GR X2 which shares the dimensions of its red counterpart:
https://www.optics-trade.eu/blog/holosun-507k-x2-footprint/
https://www.optics-trade.eu/en/holosun-507k-x2.html
Sadly, only a handful of manufacturers produce green dot sights, and there are only a few compact green dot sights out there.
What this site tells you, is what the footprints look like, and how they compare. Which is a lot more important that what you're looking for, as nobody else in the world has this information. Which leads me to THIS question:
What sight does your pistol have a mount machined into the slide for? If your pistol Doesn't Have a Mount, then who are you going to send it to, to have a mount machined into it?
Before you even start looking for a sight, you have answer that question. You can not just slap a sight onto any pistol. They have to be machined for it first.
As for small, I have the swampfox sentinel : https://www.swampfoxoptics.com/ it comes in Red and Green and I've been happy with it.
Actually, I CAN "just slap a sight onto any pistol," because I have a shop that will do exactly that - machine whatever pistol I have to accept any RDS/GDS I choose. So, for me the footprint is unimportant. What is important - to me - is seeing everything that is available so I can be sure I am making a decision with all of the possibilities in hand.
I have seen the Swampfox offerings and they are intriguing - I have not ruled them out of anything at the moment.
This article may be updated constantly, but with very little useful information.
If I wanted a list of just green dot sights - where would I find that? Not here.
Information that is useless to you might be useful to someone else. Many green dots share the footprints of their red counterparts. Which green dot do you have in mind?
This is an awesome article. It is very helpful will the multitude of mounting options out there.
With that being said, will there be an update to address the Trijicon RMRcc standard and which red dots will fit that footprint?
Thank you for your kind words!
Yes, as soon as I come across a red dot sight that shares the mounting standard with RMRcc, I will add it to the category.
Yes I understand the RMRcc is still very new.
What I'm looking for specifically is a red dot for my Canik Mete SFX. Canik states it can mount RMRcc or Shield SMS/RMS footprints. I was looking at Holosun 507k x2 but it says its a modified RMS footprint. Will it still fit the Canik Mete SFX?
Also, I'm not real familiar with Swampfox Optics. How are they comparative to Holosun?
Good evening ANDRAŽ.
I just recently purchased a Walther PDP. I was told at the gun shop that Walther will provide a slide for the red dot. Now I cant find a slide that fits the SIG Sauer Romeo 1 Reflex.
Can you help me out?
Thanks
I am sorry, Christopher, unfortunately, I do not know of such slides. Sig Sauer Romeo 1 has a very specific, unique mounting standard.
Do Aimpoint Pro Mounting system and Aimpoint Acro red dot sight mounting hardware are same? Because I have Aimpoint Pro and now I want to buy Acro red dot sight. Please let me know if anyone of you has any experience.
No, Aimpoint Pro is mounted with a 30mm ring, whereas the Acro has its own mounting standard. Here are the dimensions of the footprint of ACRO C-2:
https://www.optics-trade.eu/blog/aimpoint-acro-c-2-footprint/
I had this same problem with Springfield Armory and wrote to someone higher in the foodchain in the company and THEY got me the information I needed. I asked them how was I supposed to put a red dot sight on the pistol if they wouldn't give me the information, and could they please ask the people who DESIGNED IT to pass along the specifications?
That actually worked.
I think the people doing tier one support in customer service at most of these companies are just clueless folks who really have no idea what they're doing. You have to get past them to someone higher up.
Hi! I don't see Glock MOS mentioned at all? I can't find accurate cutout dimensions anywhere. Holosun came out with the SCS pistol green dot sight recently, but it is only is available for Glock MOS mounting. I don't see anyone sells an aftermarket Glock Gen 3 slide with MOS cut, they are all RMR cut. Gen 4 and Gen 5 slides don't fit the Gen 3. It would be nice to see what the standardized MOS dimensions should be before I machine my slide.
Aaron, thank you for bringing up the MOS footprint. It is definitely on my bucket list. I haven't been able to get hold of any MOS red dot sights yet, but I am expecting to receive the SCS in the near future. When I do, I will add it to the article!
I called Glock customer service today, and I asked for their MOS system mounting dimensions. They said "we do not provide that". I said ok, so how do I be sure an aftermarket MOS sight is the correct dimensions for a Glock MOS slide? I also said, it's not like it's some proprietary information, it's intended to work with other company's sights, I just want the proper measurements. They said "no, we do not provide that information". And he added "if you modify your slide it will void your warranty". Really? Its that pretty obvious? Now its like a personal challenge, that is ridiculous. I will make my own accurate measurements and post them for the public, this should be readily available.
I've heard several times about manufacturers unwilling to give information on certain footprints, and I don't quite understand why they are so secretive about it. I will also do my best to post MOS measurements as soon as possible ...
Bushnell Optics First Strike 2.0 is not listed on your sight. Please update.
Unfortunately, I haven't had an opportunity to get one of those yet. Do you have any information on its footprint?
I am looking for info. Company does not give that info out!
Do you have plans on adding the Eotech ELFX?
Unfortunately, I haven't been able to acquire Eotech red dot sights yet, but I will add them as soon as I do.
From EoTech, the EFLX will use the Leupold Delta Point Pro footprint.
So the only thing that fits the RMRcc footprint, is the RMRcc correct?
Could the RMRcc footprint be re-cut to fit a vortex viper or 407k?
Thanks for the hard work
Apologies for the late reply.
Exactly.
https://www.optics-trade.eu/blog/trijicon-rmrcc-footprint/
https://www.optics-trade.eu/blog/holosun-407k-x2-footprint/
This would be quite problematic to do, mostly because the screw holes are not in the same place. I wouldn't recommend it.
I was told by Holosun their 507K-X2 will fit on the Shield RMSc MP5 mount. Has anyone found this to be false?
Are you referring to the mount below?
https://www.optics-trade.eu/en/shield-sms-rms-mount-for-h-k-mp5.html
If yes, some modifications are required. The rear pins need to be removed and the front ones shortened in height.
Hello,
Yes I am. Is this something a gunsmith would do or is there like an adapter plate? Thank you so much!
Sadly, there are only a few adapter plates on the market that are designed especially for HS407/507 K. Not sure, if any of them are designed for the MP5. Yes, take it to a gunsmith, it should not be a problem.
You are welcome 🙂
Thank you!
I did find one that works on the Springfield XDS which is the same mount. It does not work on the MP however as the Springfield pins aren't full circles, but the M&P ones are.
Any adapter plate causes the sight to sit higher and not be as easy to co-witness to the iron sights. In my personal opinion you're better off not using one.
Grinding the rear two off and lowering the height of the front two isn't a difficult job. Should be easy for a gunsmith to do. I'm used to machining stuff, so I did it myself. You will also have to find new screws (any decent hardware store should have them) as the ones that come with the holosun will most likely not fit. They're M4's while the M&P is tapped for 6-32. The ones holding down the cover plate are 6-32X1/4 which are probably too short.
I put a swampfox optic on my M&P (sentinel). I would personally recommend against sights that auto-adjust brightness.
I wish I had found this a month ago. Would have saved a LOT of money.
I really wish I knew why the handgun manufacturers won't tell you what mount their pistol comes with.
Also why some of the red dot sight makers also don't supply that very information.
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I understand that the Holosun 507k does not fit the RMSc footprint but what about the inverse? Will a Shield RMSc fit on a slide that was cut for a Holosun 507k?
Yes, it does. Keep in mind though, that the front pins on the adapters designed for the HS407K/507K footprints are somewhat shallower. If you want a secure fit, adapters designed specifically for RMS/SMS sights are the best choice.
Sincerely appreciate your work here. It was extremely helpful. Thank you sir.
Is there a red dot and mount that allows for co witness on iron sights?
Yes, there is. Are you referring to an AR-15 rifle?
Very informative article. I still have a question though. I am looking at mounting a DPP on a Glock 45 MOS. What plate will I need to make it work? Also, I am looking at doing the same on a Smith & Wesson M2.0 with and MOS cut. What adapter plate would I need?
Thank You in advance
DPP shares the footprint with Shield RMS/SMS sights. This is plate designed for MOS with a cut for the Shield RMS, SMS & Leupold DPP footprint:
https://www.optics-trade.eu/en/shield-sights-sms-rms-mounting-plate-for-glock-mos-low-profile.html
If you already have a MOS adapter set, there is a plate that is designed specifically for the Leupold DPP (in one of the sets, it is numbered with '4').
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What mounts are available for a Bushnell RXS-100 to a Taurus TX22?
Even though I wasn't able to check the footprint of Bushnell RXS-100 myself, I've heard a lot of times from other people that it has the same footprint as Shield RMS/SMS and Leupold Delta Point Pro. The plates designed for these red dots should fit the Bushnell perfectly, check some of the online stores.
I have a Canik Elite that has an optic cut so small/lengthwise it wont take any optic I have. What foot print is this please? Thanks Thom II
Based on the images available on the internet, Canik Elite is compatible with red dot sights that have a Shield footprint. It would be best to check with the manufacturer, though.
Please list all screw thread pitch so we can buy proper size screws.
Have you tested the GRACE-OPTICS sight ?
Great website. Very informative, detailed footprints with measurements are awesome. I hope someone here can help me out... Sig Romeo Zero wants to join Beretta APX (non-RDO slide). Official website has 3 mounting plates: RMR, FastFire and DeltaPoint. According to this resource, the sights in question have a Shield footprint. Am I out of luck with existing one and need to look for a new Red-Dot, compatible with any of those plates? Thanks for everyone's expertise.
The footprint drawing for the Trijicon RMR only gives dimensions for the sockets and holes. It doesn't give the dimensional relationship between the actual cut in the slide and the holes. I'm looking for that info to make a CNC program.
Yes, unfortunately, we do not sell any firearms, only optics, so we merely have access to the footprints. I do agree that the information on the dimensional relationship between the actual cut in the slide and the holes would be extremely useful.
Is the Holosun HE507C-GR X2 reflex sight plate available. It's my first gun and I'm not sure if I seen it listed. Can anyone help with this concern.
Holosun HE507C-GR X2 has the same footprint as all other Holosun 407C/507C sights, the Trijicon RMR footprint.
Thanks
Hey Andraz, I'm sure you have heard this a thousand times, but what you did here is invaluable! Everyone should have this page saved on their browser and every gun shop should have this in a folder on their counter! Just wanted to make a comment about something I noticed and get your thoughts. I noticed that the Shield footprint for the bigger RMS/SMS and smaller RMSc/SMSc are basically the same. 2mm difference in length and 2mm difference in with. That's just 1mm on each side!
RMSc - Dimensions: Sight only (Length x width x height) 40 x 23 x 22 mm
RMS - Dimensions: Sight only (Length x width x height) 42 x 25 x 23 mm
If you have the Shield Low Profile Plate for the Glock MOS (which I do for my G19 Gen 4) you can switch your red dots back and forth between the RMS and RMSc footprints, e.g. Romeo Zero, Swampfox Sentinel, Crimson Trace Compact, Riton X3 TACTIX MPRD, Holosun 407K/507K. And with the Holosun you don't need to remove the rear lugs because the Shield low profile plate doesn't have any. You can also co-witness with the irons because the red dots sit so low. For anyone that has the Glock MOS Gen 4, purchase the low profile plate from Shield and you have a huge option of red dots from both the RMS and RMSc footprint. If you have a G19 MOS and Hellcat (as I) you can switch back and forth between both firearms.
Thank you so much for your kind words, these mean a lot and encourage me to keep on working on this project.
I will add the information on the difference between the RMS and RMSc to the article as a 'note'. Thank you for the information!
Even though they are different in dimensions, they should both fit on the same adapter (the distances between holes appear to be the same).
Also, thank you for all the additional information!
On my PDP which plate is used for the Sig Sauer SOR1P101 Romeo1Pro - I don't readily see a plate?
Romeo 1 Pro has a unique footprint, so I do not know of any such plates - best to contact Sig Sauer or Walther directly.
Would you have the radius dimensions for the front and rear of the Burris Fastfire3
Sorry, we do not have the radius dimensions; for now, we only provide standard, horizontal distances.
Will the Grace Optics M1 fit on a 1911 slide and clear the rear sight if I mill the slide flat?
If it can fail, it WILL fail. I want to put suppressor sights on the gun to co-witness the dot.
Looking for a way to mount a Sig Sauer Romeo Zero onto my Kel-Tec CP33's picatinny rail. Anybody know how I can accomplish this?
I sent an email complaining about your shipping charge, $50 for a 6oz item, then I discovered you are in Europe, so sorry for the complaint. Am I correct? Also, do you have a list of red dot optics listed by pistol make/model? This would be extremely helpful as some manufacturers do not always list their footprint type.
Yes, you are correct - our HQ is in Slovenia, EU. If you follow the link below, you will be able to sort the red dots in all kinds of ways (the boxes on the left), even according to their footprints.
https://www.optics-trade.eu/en/dot-sights.html
will the Walther PDP Optic Plate #06 work with Vortex Venom?
Vortex Venom shares the footprint with Docter/Noblex sights, if the #06 is designed for the Docter footprint, it will fit the Venom.
Wanted to share this info regarding the Walther PDP and the Vortex Venom. According to the Walther optic plate request form is says the Venom will not fit without modifications. See link attached.
https://waltherarms.com/optic-plate-request/
If anyone has access to a compilation of these footprint files, I can easily turn them into CAD files and make these plates. I've got three HAAS mills that can make a ton of them.
Awesome resource. And still the only comprehensive listing of reflex/red-dot footprints on the web. Great job keeping it up to date too. I've used it multiple times to figure out what sites will fit a given cut and sent others here when they have a question about fitment.
Thank you very much! I am trying my best to update the listing as frequently as possible.
Thanks this is the most helpful information I have found yet on red dot sights and mounts, which can be very confusing for someone not educated in red dot optics, thanks again.
Thank you for the kind words!
Great site! Keep up the good work!
Any ideas for the Romeo 3 XL on a Glock 17 gen 4, dovetail mount?
I have a Walther PPQ Q4 and Q5 Steel frame handguns and am considering the newer Sig Sauer Romeo 3 Max and XL for these guns. Do you have mounting plates that would allow this? I see the standard Romeo 3 listed but the Max and XL are slightly larger and may have a different footprint.
Thanks
Sig Sauer Romeo 3 Max has a C-more footprint - I've just checked it (it will be added to the article shortly). We do have a solution made by EGW in our offer:
https://www.optics-trade.eu/en/egw-vortex-razor-sight-for-walther-ppq-m2.html (it says it is made for Vortex Razor which also has the C-more footprint)
More information is available here: https://www.egwguns.com/vortex-razor-walther-ppq-sight-mount-fits-c-more-sts-sts2-rts2
The adapter won't fit your pistol if it is optics ready.
For the 509t, you mentioned “ A recoil stop helps keep the adapter in place.”
Where can I find a recoil stop? Thanks!
We refer to the lifted middle section of the footprint as the recoil stop. It fits into the notch on the adapter.
I found an adapter that will allow you to mounter a Doctor style sight on a slide with RMR cutout. It's made by Truglo.
https://truglo.com/pistol-red-dot-sight-adapter-tg8952b
Haven't heard about this one yet but it should work! 🙂 Thank you for posting this.
https://jprifles.com/buy.php?item=ARR-JP/DR
Does that help?
J-Point has the same footprint as Shield RMS, SMS, and Leupold DeltaPoint Pro, so this basically converts the Shield footprint to a Docter/Noblex footprint. Maybe it also works for the RMR, but no picture shows the bottom part.
I have a slide with RMR/507c cutout, and would like to mount a Fastfire 3 (Docter footprint). Is there an adapter that will work? So far all I have found is the opposite, an adapter that allows you to mount a RMR/507c to a Docter footprint slide.
I don't know of any such adapters. Based on the demands for these, it is quite strange that none of the mount manufacturers haven't come up with a solution yet.
Thank you so much! This is just what I needed. Really appreciate it. Ken
You are welcome!
Having a hard time finding mounting plat for my Nikon tactical spur. Really wanted to mount it on walther Q4 tac m2 walther doesn't have one either ? Any help would be appreciated. I'm thing I will be kipping this Nikon on my rifles with a rail on it.... Thanks
Do you have any images of the footprint of the red dot sight? I haven't seen that one in person before.
Do you think it would be possible to modify an ACRO plate to accept a Holosun 509t? Unity doesn't produce one as of yet.
That would be almost impossible as the ACRO Plate is much narrower than the one designed for Holosun 509T.
Are you referring to the raised shank or do you mean the overall plate? The shank would be the critical dimension. If they are different, can you please post the specs so we can all know this?
Sorry, yes, I was referring to the lifted section. Here are some images - I hope that they are of help.
Which option would be better on a Walther Q4 steel frame, the Trijicon RMR or the RMRcc? Would the smaller RMRcc provide a flush fit?
I do not have the measurements of the Q4, but you can check it with Walther, providing them with the following information:
https://www.optics-trade.eu/blog/trijicon-rmrcc-footprint/
https://www.optics-trade.eu/blog/trijicon-rmr-footprint/
Andraz,
This was a very informative article. What I didn't see noticed separately was the DeltaPoint Pro. I have a DPP that I would like to mount on an aftermarket Glock 19 slide (yet to be purchased) with a slide cut for a red dot. The problem is, the slides that I'm looking at (Zev, etc.) don't come with a cut specified for a DPP. They're mostly configured with Burris FF, RMR or Vortex Venom cuts. Judging by one of the specs, DPP shares the Shield footprint, but there aren't many/any slides offered with Shield cuts. ANy thoughts?
Thanks,
Scott
Thank you for your kind words.
the DPP is listed under the 'Shield Standard' title. This universal mount for Glock 19 should work (Type A): https://www.optics-trade.eu/si/toni-system-pistol-mount-for-glock-17-19-22-23-34-35.html
Kind Regards.
Don't see a Bushnell RXS-100 listed anywhere. What standard is it? What is it compatible with?
Even though I haven't seen this red dot sight in person yet, Bushnell's website says that it has the same footprint as Leupold Delta Point Pro, meaning that it has the 'Shield footprint'.
This is an excellent resource.
I have a question: from the photos it seems that the screw holes for the GPO Spectra are spaced longitudinally closer than Aimpoint Micro's? I'm asking because I have a mount that is similar to a Micro but its holes are spaced 3mm closer lengthwise and thus don't fit my T1 red dot. Any help would be much appreciated!
It does seem like that from the photo, but the holes on both footprints are actually of the same distance from one another.
To be honest, I don't know of any footprint where the holes would be 3 mm closer together lengthwise - but then again, I haven't seen all the red dot sights yet.
Amazing resource but I didn't find anything about the meprolight micrords footprint.
Thank you for your kind comment.
Yes, unfortunately, the info on many red dot sights is still missing as I haven't had the opportunity to check them out yet.
Do you now know what footprint they use? (Docter or whatever?) Greetings
Which red dot sight are you referring to?
I'm looking to put a Sig Romeo Zero on my APX full size and I'm wondering which of the Beretta mounts I would need to purchase, any thoughts?
In reply to Bob C.
Sig Sauer Romeo Zero presumably has a Shield footprint (I say presumably because I haven’t seen it in person yet).
If so, this mount should fit: https://www.berettausa.com/en-us/apx-deltapoint-mount-apx-optic-mount/ag-57/
(Deltapoint has the same footprint as Shield RMS and SMS)
Nevertheless, you should contact Beretta just to make sure.
RomeoZero, Shield RMSc and Holosun 507k (presumably the 407k as well) share a footprint. I've had all three of these on a Sig P365XL.
Yes as far as I know it should fit, Here is the link that is works
https://www.beretta.com/en-us/gun-accessories/handguns/kits-parts/beretta-apx-deltapoint-mount-apx-optic-mount/
Hello, have you noticed some other not-that-famous red dots like VISM Flip-dot or Swampfox Kingslayer?
I’ve seen some images that the VISM Flip-dot has the same footprint as the Trijicon RMR. It together with the Kingslayer are both some interesting red dots, i hope these two can be concluded in the webpage as well(⁎⁍̴̛ᴗ⁍̴̛⁎)
These two red dot sights sure look interesting. I haven't had the option to see them live, but I've checked the web and they are listed as having the RMR footprint, so I added them to the article.
Thank you!
what dovetail footprint do I need to mount a Riton x3 tacton PRD red dot on a Ruger sr 40
Excellent and thorough article.
I have a question regarding a possible adaptor, I have a side mount AK rail that is topped to receive only a T1/H1 style optic but in my inventory I only have picatinny mounted optics, are there any suggestions for converting a T1 base to standard picatinny? There are many that convert from picatinny to T1 but nothing the other way around.
Below are links to the rail in question.
https://www.centuryarms.com/ak-side-mount.html
https://www.opticsplanet.com/century-ci-ak-side-scope-rail-mount.html
Thank you!
thank you for the kind comment.
Unfortunately, I am not aware of any adapters that would convert the Aimpoint Micro footprint into a Picatinny. As you said, there are many on the market that convert the Picatinny rail into an Aimpoint Micro footprint, but I haven't seen any yet that would convert the other way around.
Can someone help me ? I would like to mount a Romeo3max on a SigSauer P226 X-Five skeleton. Is that possible? What assembly would I need?
P.S .: Great article!
Great information resource, thanks.
Sig Romeo Zero shares the same footprint as the Shield Sight.
do you know of anyone who makes mounting plates for Romeo 1 to Walthers Q5?
I didn't see the J-Point mentioned. I have read that it has the Doctor footprint, but also the Shield RMSC.
Thank you for putting this resource together! I’ve referred to it multiple times as I’ve purchased red dots for several pistols over the past 6-8 months.
I have a question I’m hoping you or a reader might be able to answer: does the Vortex Viper and Burris FastFire 4 share the exact same footprint? I ask because I have a slide that’s milled for a Vortex Viper but I want to replace the Viper with the FastFire. However since the slide was milled for the Vortex and fits it exactly I’m not sure that the FastFire will fit the milled area. It looks like the front of the FastFire is curved more than the Viper, but I can’t find any footprint schematics that provide a definitive answer.
I am glad to hear that the article has been of help to you as this is its main purpose.
We still haven't received a Burris Fastfire 4 to check its footprint. I've heard several times from multiple sources that it has a Docter footprint, but I can't confirm that until I see the footprint personally and do all the measurements.
It will surely be added to the article as soon as we get it.
This is an awesome source of info; I did however find a discrepancy with the shield standard and the holosun 407k/507k optics. On the optic body, there are no recesses for the rear posts, so those will have to be removed in order to accommodate that particular optic.
Dear Matt,
thank you very much for your comment.
Yes, we received the first 407K/507K sights on Friday and found out that two sockets are missing at the back. The recesses in the front appear to be shorter, too. I have just updated the article.
This is a fantastic resource and saved me from making an incorrect purchase.
Thank you very much for your efforts
Andraž,
Per your article, 507k and DDP have the same footprint, and the Sig Romeo 1 Pro should have the same footprint as the DPP. So will the Holosun 507k install directly on a Sig P320 Xcompact?
Dear Marcus,
From what I've heard, Sig Sauer Romeo 1 Pro should have the same footprint as Leupold DPP (the standard DPP has a unique footprint).
As 407K/507K feature a modification of the Shield RMS/SMS footprint, it would be best to contact Sig Sauer directly and inquire whether any modifications to the handgun are necessary.
This may seem like a dumb question but is it pretty well confirmed that the Holosun 507K and the Shield RMSc share the same footprint? I'm seeing a lot of slide milling companies that don't have 507K on their website yet but they do have Shield RMSc so I'm assuming if they're the same it's safe to order that and it would still be compatible with the Holosun 507K. Thanks for your help.
Dave,
sorry for the late reply.
The footprint is not exactly the same. 407K/507K feature a modification of the Shield SMS/RMS footprint, which means that some handguns will have to be slightly modified for these red dot sights to fit.
More information is already available in the article (it has been updated).
Thanks A lot ....this information will eliminate a lot of confusion.
Just receive my canik elite subcompact with optic ready . I was interested on getting a red dot optic but dont know which one I should go with. I know I want to try and stay around the 200 dollars range so any help would be appreciated. Thank you
This compact handgun goes well with Shield sights. In the price class around 200 €, SMS II is a great choice.
https://www.optics-trade.eu/en/shield-mini-sight-sms-red-dot-sight.html
Sig romeozero is perfect fit, direct mount, using the supplied M4 screws at 9 to 10 pound torq..
He forgot to mention that the Trijicon SRO has the same footprint as the Trijicon RMR.
Alan, thank you for your contribution. This article is constantly updated, and the input of our blog readers is extremely important to us.
Is there an adapter to go from a shield rms footprint to a vortex viper?
Dear Michael,
unfortunately, we don't have such an adapter in our offer. We also do not know of any manufacturer that produces it.
Why would you want that - you elevate the sight that way, you wanna have it as low as possible. Im sure there is one from a 3rd party supplier.
Mounted the Holosun 507c on G45 MOS. Perfect fit with zero play and 6 lbs of tork using Blue Loktite. EDC weapon and must train on presentations but have used the Venom for a few years without issue. Right handed but blind in right eye and left eye now not able to focus on FSP. Put off the red dot fad until last year. Not a fad and much easier and faster than irons. Always keep irons on weapon as backup. Train as mush as possible at dot acquisition from your EDC holster.
Thank you sir for your comments. I suffered a right eye injury a couple years ago and the sight was damaged. Now it is getting worse and as the day goes on I can barely open my right eye, rendering it nearly useless. I have carried daily for over 40 years and I think its gotten to the point where this is now the smart thing to do. Ive been using ACOG signts designed for use with both eyes open since before the injury and now its time to do the same with my pistol. I agree on the practice from the holster. I do have one of the SIRT training pistols and I believe they can be machined to allow the mounting of the same sight.
Thank you very much!!!!
Echoing James's comment, already posted to some forums
Thanks!
This is a great resource, thanks for the work. I'll be sure to send people here for reference.
Is there a way to know which mounting plate ill need to go from a sig to a trijicon rmr? On my sig 226 rx slide
God bless you, you saved me a lot of money, time and grief.
How about a mount for the old style S&W revolvers to accept a Docter? Not the new,predrlled models.
JP Enterprises makes or markets one for the J-Point red dot sight, which is the same footprint as the Doctor. I have a J-Point mounted on my S&W 500 and have used it for hunting for the past 5 years. The JP enterprises mount replaces the rear sight on newer S&W revolvers. Their current price for the mount is $49.95.
Disregard my previous comment. The Doctor optic has a different footprint than the J-Point.
JP Enterprises J-point has a Shield mounting standard.