Installing Holosun HE508T-GR Green-Dot on my MK3 FiveseveN!

Published on December 11, 2023
Duration: 9:45

This guide details the installation of a Holosun HE508T-GR green-dot optic onto an FN 5.7 MK3 pistol. The process involves removing the factory plate, selecting the correct mounting plate (identified as #1 in the video), securing the optic with screws, and performing a visual co-witness. The presenter prefers green reticles for daytime visibility and notes the importance of incremental screw tightening.

Quick Summary

To install a Holosun HE508T-GR on an FN 5.7 MK3, ensure the firearm is unloaded, remove the factory plate, and use mounting plate #1. Secure the optic with screws, tightening them incrementally and alternating sides. Applying Loctite is recommended. Green reticles are preferred by the presenter for daytime visibility.

Chapters

  1. 00:00Introduction & FN 5.7 MK3 Overview
  2. 00:23FN 5.7 Giveaway Details
  3. 00:49Optic Selection Criteria
  4. 01:07Choosing Holosun HE508T-GR (Green Reticle)
  5. 01:32Holster Recommendation (1791)
  6. 02:06Consulting the FN 5.7 Manual for Optics
  7. 02:23Identifying the Correct Mounting Plate (#1)
  8. 02:47Removing the Factory Plate
  9. 02:59Mounting the Holosun HE508T-GR
  10. 03:15Securing the Optic with Screws
  11. 03:46Importance of Loctite (Not Shown)
  12. 03:56Proper Screw Tightening Technique
  13. 04:05Visual Co-Witnessing Setup
  14. 04:10Battery Installation & Powering On
  15. 04:37Initial Alignment Check
  16. 04:49Final Thoughts & Update Promise
  17. 04:52TYM Triple P Pistol Project Promotion
  18. 05:15Merchandise Support for TYM Triple P

Frequently Asked Questions

What is the best way to install a Holosun HE508T-GR on an FN 5.7 MK3?

To install a Holosun HE508T-GR on an FN 5.7 MK3, first ensure the firearm is unloaded. Remove the factory optic plate, then select the correct mounting plate (plate #1 is indicated for this optic). Place the Holosun sight onto the plate, align it, and secure it with the provided screws, tightening them incrementally and alternating sides. Applying Loctite to the screws is recommended for long-term security.

Why did the presenter choose a green reticle for his Holosun optic?

The presenter prefers a green reticle for his Holosun HE508T-GR because he finds green dots significantly easier to pick up during daytime shooting. While red dots are common and can be better for night vision, green offers superior visibility in bright conditions for his personal preference.

What mounting plate is needed for a Holosun HE508T-GR on an FN 5.7 MK3?

According to the video, for the Holosun HE508T-GR on an FN 5.7 MK3, mounting plate number 1 is used. While the firearm's manual may list specific plates for other brands, this particular Holosun model utilizes plate #1 for proper fitment.

How can you ensure an optic is properly aligned on a pistol without live fire?

You can perform a visual co-witness alignment without live fire. After installing the optic, aim the firearm at a distant object. Then, adjust the red dot's position until it aligns with the firearm's iron sights. This method is effective for establishing a baseline zero, especially if the iron sights were previously zeroed at the desired distance.

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