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How to mount a red dot sight on Arex Delta M Gen II OR

About Arex

Arex is a firearms manufacturer based in Slovenia, mostly known for producing handguns and ammunition. It is owned by the Czech investment group RSBC which acquired it in 2017. Established in 1994, the company has catered to both the civilian and military sectors. They have a background in the tooling industry which provided them with a foundation in precision and quality. Arex Defense plays a significant role in Slovenia’s national defense and police sectors, and their pistols have also garnered attention in the international firearms community. The company continues to expand its presence in the international arms industry.

About Arex Delta M Gen II

The Arex Delta M is a semi-automatic pistol with a striker-fired, double-action trigger mechanism. It features a 102 mm barrel and a magazine capacity of 17 rounds (15 + 2). Designed with concealed carry in mind, its sleek design reduces the chance of snagging on clothing. This model includes a polymer frame, a Picatinny rail for attachments, and ambidextrous controls. It is available in the following calibers:

  • 9×19

It comes with four backstraps of varying sizes and a customizable grip module. The pistol has metal sights and is rated for +P ammunition, though regular use may hasten wear and tear of the gun. It is not silencer-compatible. As far as the colour of the frame is concerned, there are three options:

  • Black
  • FDE (flat dark earth)
  • Grey

This article examines the options for mounting red dot sights on the optic-ready Arex Delta M Gen II model. The handgun is also available in a non-optic ready version – the red dot mounting possibilities of that version are not covered in this article.

  • Arex Delta M Gen II, grey version
  • Arex Delta M Gen II, black version (source: arex.si)
  • Arex Delta M Gen II, FDE version (source: arex.si)

Differences between Arex Delta Gen I and Gen II

The Arex Delta Gen II maintains all the favorable features of its predecessor while introducing several enhancements. The Arex Delta Gen II comes in three size options: the M, maintaining the compact size of Gen I; the L, a full-size variant similar to the Glock 17; and the X, which combines a full-frame size with a compact slide. The frame comes in three colors: black, FDE (Flat Dark Earth), and grey. An upgraded grip module features a different texture with a smoother factory finish. The Picatinny rail on the bottom now includes three slots instead of one. Additionally, the Gen II boasts an enlarged, flared magwell, facilitating faster and more reliable reloading.

The properties of the optic-ready version of Arex Delta M Gen II

Arex Delta M Gen II has an optic cut that measures 48 mm in length and 23.5 mm in width.

According to our knowledge, no red dot can be mounted directly onto the optic cut (see the image below). An adapter plate is needed. If you know of any red dot sight that can be mounted directly on this pistol’s cut, please send an e-mail to [email protected]

Dimensions of the optic cut on Arex Delta M Gen II OR
Dimensions of the optic cut on Arex Delta M Gen II OR
The optic cut on Arex Delta M Gen II
The optic cut on Arex Delta M Gen II
The optic cut on Arex Delta M Gen II
The optic cut on Arex Delta M Gen II

Five adapter plates are included in the box. They are marked Type 1–5:

  • Type 1 – Docter/Noblex mounting standard
  • Type 2 – Trijicon RMR mounting standard
  • Type 3 – Leupold DeltaPoint Pro mounting standard
  • Type 4 – C-more mounting standard
  • Type 5 – Shield RMS/SMS mounting standard
All 5 adapter plates suplied with Arex Delta M Gen II
All 5 adapter plates suplied with Arex Delta M Gen II

Type 1 adapter plate is designed for the Docter/Noblex mounting standard. The plate measures 48 mm in length and 25.4 mm in width. Red dot sights with Docter/Noblex mounting standard that have a mounting surface wider than 25.4 mm protrude over the edges of the plate (you can find the dimensions in the table below).

Type 1 adapter plate
Type 1 adapter plate

Red dot sights compatible with the adapter plate Type 1

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
Delta Optical MiniDot
Delta Optical MiniDot II
Docter QUICKsight 5.0 VRDiscontinued
Docter Sight 2 PlusDiscontinued
Docter Sight 3Discontinued
Docter Sight CDiscontinued
Hawke Reflex 1×25
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
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
Hex Dragonfly
Primary Arms SLx RS-10

Type 2 adapter plate is designed for the Trijicon RMR mounting standard. The plate measures 48 mm in length and 28 mm in width.

Type 2 adapter plate
Type 2 adapter plate

Red dot sights compatible with the adapter plate Type 2

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

Type 3 adapter plate is designed for the Leupold DeltaPoint Pro mounting standard. The plate measures 48 mm in length and 25.4 mm in width.

Type 3 adapter plate
Type 3 adapter plate

Red dot sights compatible with the adapter plate Type 3

Red DotProductDetails
Holosun SCS 320
Leupold DeltaPoint Pro

Type 4 adapter plate is designed for the C-more mounting standard. The plate measures 48 mm in length and 25.4 mm in width.

Type 4 adapter plate
Type 4 adapter plate

Red dot sights compatible with the adapter plate Type 4

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

Type 5 adapter plate is designed for the Shield RMS/SMS mounting standard. There is a raised section on both the front and the rear part of the plate. The space in between the raised sections measures 43 mm in length. The plate measures 25.4 mm in width.

Type 5 adapter plate
Type 5 adapter plate

Red dot sights compatible with the adapter plate Type 5

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

Note: The following red dot sights are also compatible with type 5 adapter plate, but to mount them, the rear two pins must be filed off.

Red DotProductDetails
Holosun 407KDiscontinued
Holosun 507KDiscontinued
Holosun 407K X2
Holosun 507K X2
Arex Delta M Gen II with its accessories
Arex Delta M Gen II with its accessories

Converter plate mounting options

Note: Using a converter plate results in a high-profile setup of the red dot sight.

Shield RMS/SMS to Trijicon RMRcc

This converter plate can be mounted on the type 5 adapter plate supplied with Arex Delta M Gen II. It converts the Shield RMS/SMS mounting standard to the Trijicon RMRcc mounting standard, allowing the use of following red dot sights on Arex Delta M Gen II:

Trijicon RMR to Holosun 509

This converter plate can be mounted on the type 2 adapter plate supplied with Arex Delta M Gen II. It converts the Shield RMS/SMS mounting standard to the Holosun 509 mounting standard, allowing the use of following red dot sights on Arex Delta M Gen II:

Trijicon RMR to Aimpoint Acro

This converter plate can be mounted on the type 2 adapter plate supplied with Arex Delta M Gen II. It converts the Shield RMS/SMS mounting standard to the Holosun Acro mounting standard, allowing the use of following red dot sights on Arex Delta M Gen II:

Red DotProductDetails
Acro C-1
Acro C-2
Acro P-1
Acro P-2
Steiner MPS
Vector Optics Frenzy Plus 1x18x20

If you manufacture adapter plates for this pistol and are interested in cooperation with us, send an e-mail to [email protected].

Summary
How mount a red dot sight on Arex Delta M Gen II
Article Name
How mount a red dot sight on Arex Delta M Gen II
Description
Arex Delta M Gen II is available in both optic-ready and non-optic ready versions. With the optic ready version, you get 5 adapter plates.
Author
Publisher Name
Optics Trade
Publisher Logo

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3 Comments
  • Gjermund Vigre-Larsen says:
    Your comment is awaiting moderation. This is a preview; your comment will be visible after it has been approved.
    Hi. Does any optics fit directly without plate?
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