Don't Make This Mistake If You Own A Glock

Published on November 24, 2025
Duration: 0:38

This guide details the correct procedure for mounting an optic on a Glock MOS pistol, emphasizing the critical step of using the correct screws. Failure to do so can lead to significant malfunctions. The video highlights the importance of using the specific screws provided with the optic plate to avoid interference with the extractor assembly, which can cause failures to feed and eject. Proper installation and testing are crucial for reliable firearm function, especially in self-defense scenarios.

Quick Summary

The most common mistake when mounting optics on a Glock MOS is using the wrong screws. Using screws that are too long can interfere with the extractor assembly, causing malfunctions like failures to feed and eject. Always use the specific screws provided with your optic's mounting plate and test fire to ensure reliability.

Chapters

  1. 00:00The Glock MOS Mistake
  2. 00:09Mechanical Consequences
  3. 00:20Safety and Reliability

Frequently Asked Questions

What is the most common mistake when mounting optics on a Glock MOS?

The most common mistake is using the wrong screws. Using screws that are too long can interfere with the extractor assembly, leading to malfunctions like failures to feed and eject. Always use the specific screws provided with your optic's mounting plate.

How can incorrect optic mounting screws affect a Glock MOS pistol?

Incorrect screws, especially if too long, can physically impede the extractor's movement. This interference prevents proper extraction and ejection of spent casings or fails to allow a new round to chamber, resulting in frequent FTF and FTE malfunctions.

Why is testing crucial after mounting an optic on a Glock MOS?

Testing is vital because malfunctions caused by incorrect mounting hardware might not be apparent during dry cycling. Firing the weapon reveals these issues, preventing a potential failure during a critical self-defense situation where the firearm could jam instantly.

What is the Glock MOS system?

The Glock MOS (Modular Optic System) is a slide design that allows for the direct mounting of various red dot sights using interchangeable plates. This system aims to provide a versatile and user-friendly platform for optic-equipped pistols.

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