Turn Any Glock Into A COA Glock

Published on March 19, 2026
Duration: 10:45

This guide details the process of transforming a standard Glock into a COA Glock by installing an Aimpoint COA red dot optic. It covers GlockStore's specialized milling service, the unique mounting system of the COA optic which is secured by a specialized rear sight, and the installation of compatible front sights. The process requires sending the slide for milling and involves careful installation of the rear sight and front sight to ensure proper function and co-witness.

Quick Summary

The Aimpoint COA optic features a unique mounting system that is captured into a specially milled Glock slide via a specific bevel and a specialized rear sight. This allows the optic to sit lower and co-witness with iron sights, offering a streamlined and effective aiming solution.

Chapters

  1. 00:00Introduction to Red Dot Optics & COA
  2. 00:23Glock 43X with Aimpoint COA
  3. 00:44Aimpoint's Red Dot History and COA Mounting
  4. 01:20GlockStore's COA Cut Service
  5. 02:16Unique COA Mounting System Explained
  6. 03:26Installing COA Cut Rear Sight
  7. 04:20Tightening Screws and Loctite
  8. 06:20Importance of Tight Optics & Co-witnessing
  9. 07:25Angry Bear Arms Front Sight Options
  10. 08:11Front Sight Installation Tool
  11. 09:27GlockStore Service & Call to Action

Frequently Asked Questions

What is the Aimpoint COA optic and how does it mount on a Glock?

The Aimpoint COA is a popular red dot optic. Its unique mounting system is captured into a specially milled Glock slide via a specific bevel and a specialized rear sight, allowing it to sit lower and co-witness with iron sights.

How long does GlockStore's COA optics cut service take?

GlockStore offers a 10-day turnaround for their optics program, which includes milling the slide for optics like the Aimpoint COA. They have extensive experience, having milled over 30,000 slides.

What is co-witnessing with a red dot sight?

Co-witnessing means that your iron sights are visible through the optic's window. With the COA optic and its specialized rear sight, you can achieve a 1/10th co-witness, allowing you to see the iron sight through the red dot's glass.

What are the advantages of the COA optic's mounting system?

The COA optic's mounting system, secured by a specialized rear sight, allows it to sit lower in the slide compared to many other red dot optics. This lower profile can improve handling and sight acquisition.

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