You installed your red dot wrong.... #reddot #holosun #torque #loctite #shortshottony #9mm

Published on February 5, 2025
Duration: 0:51

This guide details the correct procedure for installing a red dot optic, specifically the Holosun HS407K X2, on a handgun. Following these steps, including proper cleaning, using blue Loctite, torquing to spec (15-17 in-lbs), and applying witness marks, ensures the optic remains secure during recoil. Proper curing of the thread locker for 24 hours is crucial before range use.

Quick Summary

Properly installing a red dot sight involves cleaning mounting surfaces, applying blue Loctite to screws, and torquing them to 15-17 inch-pounds using a torque driver. Applying witness marks helps detect loosening, and the Loctite must cure for 24 hours before firing to ensure a secure mount.

Chapters

  1. 00:00Introduction: Red Dot Loosening Issue
  2. 00:11The Loctite Mistake & Importance
  3. 00:15Step 1: Preparation & Cleaning
  4. 00:19Step 2: Mounting the Optic
  5. 00:21Step 3: Applying Blue Loctite
  6. 00:25Step 4: Initial Hand Tightening
  7. 00:31Step 5: Torquing to Spec (15-17 in-lbs)
  8. 00:41Step 6: Applying Witness Marks
  9. 00:46Final Step: Curing Time

Frequently Asked Questions

What is the correct torque specification for mounting a Holosun HS407K X2 red dot sight?

The recommended torque specification for mounting the Holosun HS407K X2 is 15-17 inch-pounds (in-lbs). It is crucial to use a torque driver set to inch-pounds, not foot-pounds, to avoid damaging the optic or the firearm's slide.

What type of Loctite should be used when installing a red dot sight?

For installing red dot sights, it is recommended to use blue Loctite (such as Loctite 242 or 243). This type provides a secure hold that resists vibration but allows for disassembly with standard tools. Red Loctite should be avoided as it is permanent.

Why are witness marks important when installing a red dot sight?

Witness marks, created by drawing a line across the screw head and onto the optic body, are important because they provide a quick visual indicator. If the screw begins to loosen, the line will break, alerting you to potential issues before the optic becomes significantly loose or detaches.

How long should you wait after installing a red dot sight before firing the firearm?

After installing a red dot sight and applying thread locker, you should allow a minimum of 24 hours for the Loctite to fully cure. This curing period ensures the thread locker achieves its maximum strength, preventing the optic from loosening under recoil.

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