How to Install Holosun 407c on Glock 19

Published on February 11, 2023
Duration: 4:03

This guide details the straightforward installation of a Holosun 407C red dot sight onto a Brownells Glock 19 Gen 4 MOS slide. It covers the importance of proper optic alignment, the use of blue Loctite for screw security, and considerations for suppressor height versus factory sights regarding co-witness. The process is presented as simple and achievable for beginners.

Quick Summary

Installing a Holosun 407C on a Glock 19 Gen 4 MOS slide is straightforward. The optic typically fits directly into the slide's cut without an extra plate. Use blue Loctite on Torx T10 screws for security against recoil. Factory sights offer a lower sight picture, while suppressor height sights provide an absolute co-witness.

Chapters

  1. 00:00Introduction
  2. 00:34Sight Co-Witness Discussion
  3. 00:55Factory vs. Suppressor Height Sights
  4. 01:32Optic Mounting Procedure
  5. 02:02Screw Installation and Tightening
  6. 03:19Final Installation and Review
  7. 03:38Conclusion and Call to Action

Frequently Asked Questions

Do I need a special plate to mount a Holosun 407C on a Glock 19 Gen 4 MOS slide?

No, typically you do not need an additional mounting plate for a Holosun 407C on a Glock MOS slide. The optic is designed to fit directly into the slide's optic cut, providing a snug and secure fit without extra components.

What type of screws are used to mount a Holosun 407C on a Glock 19 Gen 4 MOS slide?

The mounting screws for a Holosun 407C on a Glock 19 Gen 4 MOS slide are usually Torx T10 size. Both the optic manufacturer and the slide manufacturer (like Brownells) often provide compatible screws.

Should I use Loctite when installing a red dot sight on my pistol?

Yes, it is highly recommended to use blue Loctite on the mounting screws when installing a red dot sight. This helps prevent the screws from vibrating loose due to the firearm's recoil, ensuring the optic remains securely attached.

What is the difference between absolute co-witness and lower 1/3 co-witness with red dot sights?

Absolute co-witness means your iron sights are centered in the red dot's window, appearing directly above the dot. Lower 1/3 co-witness means the iron sights are in the lower third of the optic's window, allowing the dot to be the primary aiming point.

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