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Footprints/Mounting Standards on Red Dot Sights

Note: This article is updated constantly. Last update: 15 January 2024.

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.

Red Dot Sights

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.

to see our database of all footprints of red dot sights

Table Preview Footprints

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 patternsocket 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.

Screw hole pattern and socket pattern form a mounting standard. Here, Shield RMS is used as an example.
Screw hole pattern and socket pattern form a mounting standard. Here, Shield RMS is used as an example.

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.

Footprint of Shield RMS
Footprint of Shield RMS

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.

Docter Mounting Standard
Docter Mounting Standard

Red dot sights that share this mounting standard:

Red DotProductDetails
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 RD3-012 Delta Pro
ADE Advanced Optics RD3-013 Bertrillium
Athlon Midas TSR1
Burris Fastfire 2*
Burris Fastfire 3*
Burris Fastfire 4
Cuda RX-795
Delta Optical MiniDot 3
Delta Optical MiniDot II*
Delta Optical MiniDot*
Docter QUICKsight 5.0 VRDiscontinued
Docter Sight 2 PlusDiscontinued
Docter Sight 3Discontinued
Docter Sight CDiscontinued
Hawke Reflex 1×25*
Hex Dragonfly
Leica Tempus
Leica Tempus 2
MAKdot 1×25
MAKdot SH
Meopta Meosight IV
Noblex QUICKsight 5.0 VR
Noblex Sight 2 Plus
Noblex Sight 3
Noblex Sight C
Noblex Sight G
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 1×20
Vortex Venom
Vortex Viper

* 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.

Leica Tempus ASPH footprint
Leica Tempus ASPH footprint

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:

Red DotProductDetails
Bushnell AR Optics Micro Reflex
Meopta Meosight III
Delta Optical MiniDot HD 25
Meprolight MicroRDS

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).

Meopta Meosight III (above) and Docter Sight C (below) (source: Christian S.)
Meopta Meosight III (above) and Docter Sight C (below) (source: Christian S.)
Meopta Meosight III (above) and Docter Sight C (below) (source: Christian S.)
Meopta Meosight III (above) and Docter Sight C (below) (source: Christian S.)
An EAW adapter for Docter & Noblex mounting standard (left) and an adapter for Delta Optical MiniDot HD 25
An EAW adapter for Docter & Noblex mounting standard (left) and an adapter for Delta Optical MiniDot HD 25
Noblex Sight III (left) and Delta Optical MiniDot HD 25 (right)
Noblex Sight III (left) and Delta Optical MiniDot HD 25 (right)
Various adapters for the Docter/Noblex footprint (for different pistols) (source: Christian S.)
Various adapters for the Docter/Noblex mounting standard (for different pistols) (source: Christian S.)

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.

Aimpoint Micro Mounting Standard
Aimpoint Micro Mounting Standard

Red dot sights that share this mounting standard:

Red DotProductDetails
Actus Core-1 1×20
Actus Core-2 1×20
Aimpoint CompM5
Aimpoint CompM5b
Aimpoint CompM5s
Aimpoint Duty RDS
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
Bushnell TRS-125
DI Optical SP1
Holosun 403B
Holosun 403C
Holosun 403GL
Holosun 403R
Holosun 503BU
Holosun 503C
Holosun 503CU
Holosun 503FL
Holosun 503G
Holosun 503GU
Holosun 503R
Holosun 515C
Holosun 515CM
Holosun 515CT
Holosun 515GM
Holosun 515GT
Holosun 530C
Holosun 530G
Kahles Helia RD-C
MAKdot S 1×20
Minox RV1
Primary Arms SLX Advanced Rotary Knob
Primary Arms SLX MD-20
Sig Sauer Romeo4
Sig Sauer Romeo4S 1×20
Sig Sauer Romeo5
Sig Sauer Romeo-MSR
Sightmark Element Mini Solar
Sightmark Wolverine 1×23 CSR
Sightmark Wolverine 1×28 FSR
Swampfox Liberator 1×22
Vector Optics Centurion 1×20
Vector Optics Maverick 1×22
Vector Optics Maverick 1×22 Gen II
Vector Optics Scrapper 1×22
Vector Optics Scrapper 1×25
Vortex Crossfire
Vortex Sparc AR
Vortex Sparc Solar
ZeroTech Thrive
Aimpoint Micro H-1 Footprint
Aimpoint Micro H-1 Footprint

Modifications of the Aimpoint Micro mounting standard

Red dot sights that feature a modified Aimpoint Micro mounting standard:

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.

GPO Spectra and its mounting standard (right) next to Aimpoint Micro H-2 and its mounting standard (left)
GPO Spectra and its mounting standard (right) next to Aimpoint Micro H-2 and its mounting standard (left)
An adapter designed for GPO Spectra's mounting standard (right) next to the adapter designed for Aimpoint Micro's mounting standard (left)
An adapter designed for GPO Spectra’s mounting standard (right) next to the adapter designed for Aimpoint Micro’s mounting standard (left)
An adapter designed for GPO Spectra's mounting standard
An adapter designed for GPO Spectra’s mounting standard
GPO Spectra Red Dot Footprint
GPO Spectra Red Dot Footprint

Hawke Endurance 1×25 and 1×30 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.

Hawke Endurance 1x30 Mounting Standard
Hawke Endurance 1×30 footprint
Hawke Endurance 1x30 does not fit on an EAW adapter designed for a Docter & Noblex mounting standard
Hawke Endurance 1×30 does not fit on an EAW adapter designed for a Docter & Noblex mounting standard

Rudolph Optics 1×20

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 1×20.

Rudolph Optics 1x20 Footprint
Rudolph Optics 1×20 Footprint

Vector Optics Maverick-IV 1×20 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 1×20 Mini is not compatible with adapters designed for the Aimpoint Micro mounting standard.

Vector Optics Maverick IV 1x20 Mini Footprint
Vector Optics Maverick IV 1×20 Mini Footprint

ADE Advanced Optics RD4-005

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.

ADE Advanced Optics RD4-005 Footprint

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.

C-more RTS, STS Mounting Standard
C-more RTS, STS Mounting Standard

Red dot sights that share this mounting standard:

Red DotProductDetails
C-more RTS
C-more RTS 2
C-more STS
C-more STS 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 1×25
Sig Sauer Romeo3 Max 1×30
Sig Sauer Romeo3 XL 1×35
Vector Optics Frenzy 1x26x32
Vortex Razor
C-More STS2 Footprint
C-More STS2 Footprint

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:

Red DotProductDetails
ADE Advanced Optics RD3-018 Spike
ADE Advanced Optics RD3-021 Nuwa
ADE Advanced Optics RD3-021 Nuwa Pro
Ade Advanced Optics RD3-030 Apollo Pro
GPO Spectra Pistol Dot
JP Enterprises JPoint
Shield RMS
Shield RMS 2
Shield RMSc
Shield RMSd
Shield RMSw
Shield RMSx
Shield SMS
Shield SMS 2.0
Shield SMSc
Sig Sauer Romeo Zero
Sightmark Mini Shot A-Spec M3
Swampfox Sentinel 1×16
UTG OP3 Mini Micro
Vector Optics Frenzy-S 1x16x22
Vector Optics Frenzy-S 1x17x24 MIC
Vortex Defender CCW
Shield RMS footprint
Shield RMS footprint
Docter, Noblex footprint (top) and Shield footprint (bottom)
Docter, Noblex footprint (top) and Shield footprint (bottom)
 
Shield RMS/SMS Mounting Standard
Shield RMS/SMS Mounting Standard

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
Shield RMS (left) and Shield RMSc (right)

Modifications of the Shield RMS/SMS mounting standard

Leupold DeltaPoint Pro mounting standard

Even though Leupold DeltaPoint Pro fits on mounts designed for the Shield RMS/SMS mounting standard, it does not result in a secure fit, because its sockets are wider than the pins on adapters for Shield RMS/SMS. Therefore, mount manufacturers usually produce mounts specifically for the Leupold DeltaPoint Pro. Furthermore, red dot sights with the Shield RMS/SMS mounting standard do not fit on mounts designed specifically for the Leupold DeltaPoint Pro.

The four sockets on Leupold DeltaPoint Pro’s mounting surface are wider than those on a Shield RMS/SMS mounting standard. Namely, the sockets measure 4.2 mm in diameter, while the sockets the Shield RMS/SMS mounting standard measure 3.8 mm in diameter.

Red dot sights that feature this mounting standard:

Red DotProductDetails
Holosun SCS 320
Leupold DeltaPoint Pro
Leupold DeltaPoint Pro Footprint
Leupold DeltaPoint Pro Footprint
Leupold DeltaPoint Pro mounting standard
Leupold DeltaPoint Pro mounting standard

Holosun 407/507K mounting standard

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).

Red DotProductDetails
Holosun 407KDiscontinued
Holosun 507KDiscontinued
Holosun 407K X2
Holosun 507K X2
Holosun 507K X2 footprint
Holosun 507K X2 footprint

Holosun EPS mounting standard

The red dot sights listed below feature a mounting surface modified even more extensively (compared to the Holosun 407/507K modification):

The mounting surfaces of these red dot sights have the same modifications as those found on Holosun 407/507K devices, with an addition of the following features:

  • There are two additional sockets in the front part of the mounting surface, placed in between the usual ones. Holosun produces plates that convert this specific mounting surface to the other ones (Trijicon RMR, for example).
Holosun EPS footprint
Holosun EPS footprint

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:

Red DotProductDetails
ADE Advanced Optics RD3-019 Stingray
ADE Advanced Optics RD3-020 Raptor
ADE Advanced Optics RD3-023 Valkyrie
Holosun 407C
Holosun 407C V2
Holosun 407C X2
Holosun 507C
Holosun 507C V2
Holosun 507C X2
Holosun 507COMP
Holosun 508T
Holosun 508T X2
NcStar VISM FlipDot Pro
Riton X3 Tactix PRD
Swampfox Justice RMR 1×27
Swampfox Liberty RMR 1×22
Swampox Kingslayer
Trijicon RMR
Trijicon SRO
Vector Optics Frenzy 1x22x26
Trijicon RMR footprint
Trijicon RMR footprint
Trijicon RMR Mounting Standard
Trijicon RMR Mounting Standard

Modifications of the Trijicon RMR mounting standard

Red dot sights that feature a modified Trijicon RMR 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.

ADE Advanced Optics RD3-019 Stingray Footprint
ADE Advanced Optics RD3-019 Stingray Footprint

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:

Red DotProductDetails
Trijicon MRO
Trijicon MRO Patrol
Burris RT-1X
Trijicon MRO Footprint
Trijicon MRO Footprint

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).

Trijicon's original adapter for the MRO mounting standard (right - original screw, left - a screw supplied with Burris RT-1X)
Trijicon’s original adapter for the MRO mounting standard (right – original screw, left – a screw supplied with Burris RT-1X)

Modifications of the Trijicon MRO mounting standard

Vector Optics Centurion 1×30 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).

Vector Optics Centurion 1x30 mounting standard
Vector Optics Centurion 1×30 footprint

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:

Red DotProductDetails
Holosun SCS MOS
Noblex Red Dot Sight for Glock MOS
Holosun SCS MOS Footprint
Holosun SCS MOS Footprint
Holosun SCS MOS footprint, featuring the Glock MOS mounting standard
Holosun SCS MOS footprint, featuring the Glock MOS mounting standard

Walther PDP 2.0 mounting standard

Walther’s PDP models are optic-ready, but there is a difference between the cuts of 1.0 and 2.0 models, so you have to be careful if you are looking for a mounting plate. Red dot sights with this mounting standard are designed to fit directly on the Walther PDP 2.0 models, no additional plates are required. There are two screw holes for mounting purposes. See the image below for more details.

Red dots that share this mounting standard:

Holosun SCS PDP 2.0 Footprint
Holosun SCS PDP 2.0 Footprint
Walther PDP 2.0 mounting standard
Holosun SCS PDP 2.0 footprint, featuring the Walther PDP 2.0 mounting standard

Heckler & Koch VP9 mounting standard

This mounting standard is compatible with Heckler & Koch VP9 optic-ready pistols. Red dot sights equipped with it fit directly on the pistol cut, no additional plates are required. There are two screw holes for mounting purposes – check the other characteristics of the standard in the image below.

Red dots that share this mounting standard:

Holosun SCS VP9 Footprint
Holosun SCS VP9 Footprint
Heckler & Koch VP9 mounting standard

Holosun SCS VP9 Footprint, featuring the Heckler & Koch VP9 mounting standard

Smith & Wesson M&P 2.0 mounting standard

This mounting standard is designed to fit directly onto the cut of Smith & Wesson M&P 2.0 optic-ready pistols, without having to use an additional plate. There are two screw holes for mounting purposes – the other features can be observed in the image below.

Red dots that share this mounting standard:

Holosun SCS MP2 Footprint
Holosun SCS MP2 Footprint
Smith & Wesson M&P 2.0 mounting standard
Holosun SCS MP2 footprint, featuring the Smith & Wesson M&P 2.0 mounting standard

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:

Red DotProductDetails
Acro C-1
Acro C-2
Acro P-1
Acro P-2
Steiner MPS
Vector Optics Frenzy Plus 1x18x20
Aimpoint Acro C-1 Footprint
Aimpoint Acro C-1 Footprint
Aimpoint Acro C-1 Footprint
Aimpoint Acro C-1 footprint, featuring the Aimpoint Acro mounting standard

Note: distances between holes (sockets) are measured from and to the center of the hole (socket).

Important notes (Steiner MPS)

Steiner MPS features the same mounting standard as Aimpoint ACRO but its footprint is slightly different. The grooves in which the adapter fits 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. The same applies to Vector Optics Frenzy Plus 1x18x20.

Steiner MPS Footprint
Steiner MPS footprint

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.

Aimpoint CompM4s Footprint
Aimpoint CompM4s Footprint

Red dot sights that share this mounting standard:

Red DotProductDetails
Aimpoint CompM4h
Aimpoint CompM4s

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:

Red DotProductDetails
C-More Railway
C-More Tactical Railway
C-More Slide Ride
https://www.optics-trade.eu/blog/wp-content/uploads/2022/03/C-More-Slide-Ride-Footprint-1.jpg
C-More Slide Ride Footprint

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 Footprint
C-More Serendipity
C-More Serendipity Footprint
C-More Serendipity

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 DotProductDetails
Holosun AEMS
Holosun AEMS Core
Holosun AEMS Footprint
Holosun AEMS Footprint

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.

Trijicon RMRcc Footprint
Trijicon RMRcc Footprint
Trijicon RMRcc Footprint
Trijicon RMRcc Footprint, featuring the Trijicon RMRcc mounting standard

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.

Holosun 509T Footprint
Holosun 509T Footprint
Holosun 509T with an RMR adapter for its mounting standard
Holosun 509T with an RMR adapter for its mounting standard
From left to right - Holosun 509 T adapter, Aimpoint ACRO adapter, Aimpoint ACRO, Holosun 509T
From left to right – Holosun 509 T adapter, Aimpoint ACRO adapter, Aimpoint ACRO, Holosun 509T
Holosun 509T Adapter (left) and Aimpoint ACRO adapter (right)
Holosun 509T Adapter (left) and Aimpoint ACRO adapter (right)

The mounting surface of the Infinity models is flat, with three notches for recoil stoppers. The adapter is fixed in place with four screws.

Holosun Infinity mounting standard
Holosun Infinity footprint

Sig Sauer’s Romeo 1 1×30 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.

Sig Sauer Romeo1 1x30 Footprint
Sig Sauer Romeo1 1×30 Footprint

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.

Steiner MRS mounting standard
Steiner MRS footprint
Steiner MRS Universal's mounting standard
Steiner MRS Universal’s footprint
Steiner MRS Universal with the supplied adapter for the Docter & Noblex mounting standard
Steiner MRS Universal with the supplied adapter for the Docter & Noblex mounting standard
Steiner MRS with the supplied adapter, paired with a Picatinny adapter for the Docter & Noblex mounting standard
Steiner MRS with the supplied adapter, paired with a Picatinny adapter for the Docter & Noblex mounting standard
  • Holosun Paralow 403A
Holosun Paralow HS403 A footprint
Holosun Paralow HS403 A footprint

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.

Holosun 510C Footprint
Holosun 510C Footprint
DI Optical RV2 mounting standard
DI Optical RV2 footprint

Even though the mounting standard found on Vector Optics Nautilus 1×30 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.

Vector Optics Nautilus 1x30 mounting standard
Vector Optics Nautilus 1×30 footprint
DI Optical RV 2 (left) and Vector Optics Nautilus 1×30 (right) with supplied adapters
DI Optical RV 2 (left) and Vector Optics Nautilus 1×30 (right)

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.

Sightmark Volta Footprint
Sightmark Volta Footprint
Sightmark Volta Footprint
Sightmark Volta Footprint

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.

Vector Optics Wraith 1x22x33 Footprint

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.

ADE Advanced Optics RD3-011 Avenger Footprint
ADE Advanced Optics RD3-011 Avenger Footprint

A list of all the red dot sights, their mounting standards and footprints

Red Dot SightMounting standardRed DotMountDetails
Actus Core-1 1x20
Actus Core-2 1x20
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 RD3-011 Avenger
ADE Advanced Optics RD3-012 Delta
ADE Advanced Optics RD3-013 Bertrillium
ADE Advanced Optics RD3-018 Spike
ADE Advanced Optics RD3-019 Stingray
ADE Advanced Optics RD3-020 Raptor
ADE Advanced Optics RD3-021 Nuwa
ADE Advanced Optics RD3-021 Nuwa Pro
ADE Advanced Optics RD3-023 Valkyrie
ADE Advanced Optics RD3-030 Apollo Pro
ADE Advanced Optics RD4-005
Ade Advanced Optics RD-012 Delta Pro
Aimpoint ACRO C-1
Aimpoint ACRO C-2
Aimpoint ACRO P-1
Aimpoint ACRO P-2
Aimpoint CompM4h
Aimpoint CompM4s
Aimpoint CompM5
Aimpoint CompM5
Aimpoint CompM5b
Aimpoint CompM5s
Aimpoint Duty RDS
Aimpoint Micro H-1
Aimpoint Micro H-2
Aimpoint Micro T-1
Aimpoint Micro T-2
Athlon Midas TSR1
Athlon Midas TSR2
Blaser RD 17
Burris Fastfire 2(enclosed adapter with wider threaded sockets)
Burris Fastfire 3(enclosed adapter with wider threaded sockets)
Burris Fastfire 4
Burris Fastfire RD
Burris RT-1X
Bushnell AR Optics Micro Reflex(similar to Docter/Noblex standard)
Bushnell TRS-125
C-More Railway
C-more RTSDiscontinued
C-more RTS 2
C-More Serendipity
C-More Slide Ride
C-more STSDiscontinued
C-more STS 2
C-More Tactical Railway
Cuda RX-795
Delta Optical MiniDot(enclosed adapter with wider threaded sockets) Discontinued
Delta Optical MiniDot 3(enclosed adapter with wider threaded sockets)
Delta Optical MiniDot HD 24
Delta Optical MiniDot HD 25(similar to Docter/Noblex standard)
Delta Optical MiniDot HD 26
Delta Optical MiniDot II(enclosed adapter with wider threaded sockets)
Delta Optical Stryker
DI Optical RV2
DI Optical SP1
Docter QUICKsight 5.0 VR
Docter Sight 2 Plus
Docter Sight 3
Docter Sight C
FTP Optics Alpha 3
GPO Spectra
GPO Spectra Pistol Dot
Hawke Endurance 1x25
Hawke Endurance 1x30
Hawke Reflex 1x25(enclosed adapter with wider threaded sockets)
Holosun 407C
Holosun 407C V2
Holosun 407C X2
Holosun 407K(modification of the Shield standard)
Holosun 407K X2(modification of the Shield standard)
Holosun 507C
Holosun 507C V2
Holosun 507C X2
Holosun 507COMP
Holosun 507K(modification of the Shield standard)
Holosun 507K X2(modification of the Shield standard)
Holosun 508T
Holosun 508T X2
Holosun 509T
Holosun 510C
Holosun AEMS
Holosun AEMS Core
Holosun EPS(modification of the Shield standard)
Holosun EPS Carry(modification of the Shield standard)
Holosun Infinity models
Holosun Paralow 403A
Holosun Paralow 403B
Holosun Paralow 403C
Holosun Paralow 403GL
Holosun Paralow 403R
Holosun Paralow 503BU
Holosun Paralow 503C
Holosun Paralow 503CU
Holosun Paralow 503FL
Holosun Paralow 503G
Holosun Paralow 503GU
Holosun Paralow 503R
Holosun Paralow 515C
Holosun Paralow 515CM
Holosun Paralow 515CT
Holosun Paralow 515GM
Holosun Paralow 515GT
Holosun Paralow 530C
Holosun Paralow 530G
Holosun SCS 320
Holosun SCS M&P 2.0
Holosun SCS MOS
Holosun SCS PDP
Holosun SCS VP9
JP Enterprises JPoint
Kahles Helia RD
Kahles Helia RD-C
Kite Optics K1
Leica Tempus
Leica Tempus 2
Leupold Delta Point Pro
MAKdot 1x25
MAKdot S 1x20
MAKdot SH
Meopta Meosight III(similar to Docter/Noblex standard)
Meopta Meosight IV
Meprolight MicroRDS(similar to Docter/Noblex standard)

Minox RV1
NcStar VISM FlipDot Pro
Noblex QUICKsight 5.0 VR
Noblex Sight 2 Plus
Noblex Sight 3
Noblex Sight C
Noblex Sight G
Primary Arms SLX Advanced Rotary Knob
Primary Arms SLX MD-20
Riton X3 Tactix PRD
Rudolph Optics 1x20
Shield RMS
Shield RMS 2
Shield RMSc
Shield RMSd
Shield RMSw
Shield RMSx
Shield SMS
Shield SMS 2.0
Shield SMSc
Sig Sauer Romeo1 1x30
Sig Sauer Romeo3 1x25
Sig Sauer Romeo3 Max 1x30
Sig Sauer Romeo3 XL 1x35
Sig Sauer Romeo4
Sig Sauer Romeo4S 1x20
Sig Sauer Romeo5
Sig Sauer Romeo Zero
Sig Sauer Romeo-MSR
Sightmark Element Mini Solar
Sightmark Mini Shot A-Spec M3
Sightmark Mini Shot M-Spec
Sightmark Mini Shot Pro Spec(enclosed adapter with wider threaded sockets)
Sightmark Volta
Sightmark Wolverine 1x23 CSR
Sightmark Wolverine 1x28 FSR
Steiner MPS
Steiner MRS
Steiner MRS UniversalDiscontinued
Swampfox Justice RMR 1x27
Swampfox Liberator 1x22
Swampfox Liberty RMR 1x22
Swampfox Sentinel 1x16
Swampox Kingslayer
Trijicon MRO
Trijicon MRO Patrol
Trijicon RMR
Trijicon RMRcc
Trijicon SRO
US Optics DRS 2.0(enclosed adapter with wider threaded sockets)
US Optics DRS 2.0 Enhanced(enclosed adapter with wider threaded sockets)
UTG OP3 Micro
UTG OP3 Mini Micro
Vector Optics Centurion 1x20
Vector Optics Centurion 1x30(modification of the Trijicon MRO standard)
Vector Optics Frenzy 1x17x24
Vector Optics Frenzy 1x20x28(enclosed adapter with wider threaded sockets)
Vector Optics Frenzy 1x22x26
Vector Optics Frenzy 1x26x32
Vector Optics Frenzy Plus 1x18x20
Vector Optics Frenzy-S 1x16x22
Vector Optics Frenzy-S 1x17x24 MIC
Vector Optics Maverick 1x22
Vector Optics Maverick 1x22 Gen II
Vector Optics Maverick IV 1x20 Mini
Vector Optics Nautilus 1x30
Vector Optics Scrapper
Vector Optics Scrapper 1x22
Vector Optics Wraith 1x22x33
Vomz Pilad 1x20
Vortex Crossfire
Vortex Defender CCW
Vortex Razor
Vortex Sparc AR
Vortex Sparc Solar
Vortex Venom
Vortex Viper
Vortex Viper
ZeroTech Thrive

Red dot sights with an integrated Picatinny mount

Red Dot SightRed Dot
ADE Advanced Optics RD2-007
Athlon Midas TSR3
Hawke Vantage 1x20
Hawke Vantage 1x25
Hawke Vantage 1x30
Holosun 512C
Holosun 512T
Sightmark Ultra Shot A-Spec
Sightmark Ultra Shot M-Spec
Sightmark Ultra Shot R-Spec
Steiner MRS Gen II Picatinny
UTG ITA CQB Dot Sight
Vector Optics Omega

Red dot sights with an integrated Blaser mount

Blaser RD20

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:

Optic ready handguns

The popularity of optic ready handguns is on the rise. Do you have an optic ready handgun and wish to know how to mount a red dot sight on it? We are working on making it simpler for you. Below is a list of all the optic-ready handguns we have examined so far.

PistolDetails
Arex Delta M Gen II OR
Canik Mete SFT
HS H11 Pro RDR
HS H11 RDR

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 [email protected]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.

Summary
Footprints on red dot sights
Article Name
Footprints on red dot sights
Description
In this article, the most common footprints/mounting standards used on red dot sights are listed. Each standard is described and an image of it is added.
Author
Publisher Name
Optics Trade Blog
Publisher Logo

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171 Comments
  • 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 …

  • 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.

  • 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.

  • 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

  • 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?

      • 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?

  • 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.

  • 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.

    • 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.

  • 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

  • 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.

  • 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.

  • 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?

  • I have a Sightron SRS-2 red dot sight and need to see the footprint for this sight. The mount for the Burris Fastfire III has 4 posts in the corners and can they be filed down to fit the Sightron SRS-2 sight? Have ordered the Sightron SRS-2 sight from Camera Land….will ship in few days. Do not see the footprint for the SRS, only the STS and RTS. Thanks for any help.

  • This is fantastic. I have 3 Burris Fastfires. The # has a top battery cover so no sight removal is needed. I’d like to see which other sights have a top mounted battery cover.

  • Wow. You spent a lot of time creating this. I recently bought a pistol and have spent hours clicking around the internet looking for some specific/detailed information. Found it!!!!!!

    Thank you….

  • Thank you so much for this site. I was wondering if you had come across any universal plates that can be attached to a variety of bases and allow a variety of mounts to be used?

  • Andraž thank you so much for this extremely informative site!

    Looking for a plate to mount a Holosun 507k on a Taurus 101. Similar to Beretta 92/96 but no dovetail for rear sight. The correct plate will need the curved profile of the Beretta slide and will require slide to be drilled tapped.

    Does anyone make such a plate?

    • Apologies, Jeff, I don’t know of such plate. Have you tried contacting Taurus? They might have some more information.

  • hello ,
    how deep is the #6-32 thred needs to be on the slide for RMR cut ?
    whats the radius on the front of the RMR cut ?

  • The P30 (and I expect the P30sk as well) slide tapers slightly to a flat top. Do you recommend a 507C x2 or a 507K x2?

  • Quintin says:
    Your comment is awaiting moderation. This is a preview; your comment will be visible after it has been approved.
    Wow, thanks so much for the effort put into this, its super helpful!
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