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MOS - Modular Optic System

MOS - Modular Optic System Configuration

GLOCK engineers have developed the Modular Optic System Configuration to simplify mounting of popular optical sights.
The MOS Configuration is the best choice to hit your target.

GLOCK MOS Adapter Set 01

MOS Adapter set 01

The GLOCK MOS Adapter set 01 fits for GLOCK Pistols in MOS Configuration slide width 25,5 mm/1.00 in. It consists of 4 numbered GLOCK MOS Adapter plates available for optical sights of following manufacturers:

  • Adapter Docter, Meopta, Insight (01)
  • Adapter Trijicon (02)
  • Adapter C-More (03)
  • Adapter Leupold (04)

The MOS Adapter set includes a Torx® screwdriver (TX10) and 4 Torx® screws to install the GLOCK MOS Adapter plates. All screws come with a drop of glue applied.

GLOCK MOS Adapter Set 02

MOS Adapter set 02

The GLOCK MOS Adapter set 02 fits for GLOCK Pistols in MOS Configuration slide width 28,5 mm/1.12 in. It consists of 4 numbered GLOCK MOS Adapter plates available for optical sights of following manufacturers:

  • Adapter Docter, Meopta, Insight (05)
  • Adapter Trijicon (06)
  • Adapter C-More (07)
  • Adapter Leupold (08)

The MOS Adapter set includes a Torx® Screwdriver (TX10) and 4 Torx® screws to install the GLOCK MOS Adapter plates. All screws come with a drop of glue applied.

GLOCK with reflex optics

What´s the difference between reflex optics (MOS) and standard iron sights?

Optical sights: With the reflex optics, you look through the reticle and focus on the target and alignment of the dot.

Standard sights: With standard iron sight shooting, you align the front and rear sight with a hard focus on the front sight.

Optical sights are popular in competitive shooting and are becoming increasingly popular for home defense and target shooters.


How to install your optical sight on a GLOCK pistol in MOS Configuration:

Install optical sight on GLOCK pistol - Step 1

Step 1

To install the applicable MOS Adapter plate remove the GLOCK Cover plate first.

Install optical sight on GLOCK pistol - Step 2

Step 2

Then select the appropriate GLOCK MOS Adapter plate (see table and markings of the GLOCK MOS Adapter plates) and place it in the correct position and orientation.

Install optical sight on GLOCK pistol - Step 3

Step 3

Tighten the 2 Torx® screws to fix the GLOCK MOS Adapter Plate on your GLOCK MOS Pistol.

Install optical sight on GLOCK pistol - Step 4

Step 4

When the GLOCK MOS Adapter plate is completely mounted on your GLOCK MOS Pistol install the optical system according to the directions of the manufacturer.


The following GLOCK pistols are available in the Modular Optic System (MOS) Configuration

G17 Gen4 MOS

G17 Gen4 MOS

STANDARD | 9mm Luger

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G34 Gen4 MOS

G34 Gen4 MOS

COMPETITION | 9mm Luger

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G35 Gen4 MOS

G35 Gen4 MOS

COMPETITION | 40 S&W

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G40 Gen4 MOS

G40 Gen4 MOS

LONG SLIDE | 10mm Auto

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G41 Gen4 MOS

G41 Gen4 MOS

COMPETITION | 45 Auto

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