A 13in .308 with an FRT! The Battle Rifle at Home!

Published on December 31, 2025
Duration: 9:03

This guide details the installation and testing of an AS Designs Arcfire Forced Reset Trigger (FRT) on an HK MR762. It covers potential fitting adjustments, manual function checks, and live-fire testing at an outdoor range. The guide also includes troubleshooting steps for common malfunctions associated with FRTs on AR-10 platforms, drawing on expert insights regarding reliability and gas system tuning.

Quick Summary

The AS Designs Arcfire FRT can significantly increase the rate of fire on an HK MR762, creating a 'battle rifle at home'. Installation may require modifying the trigger shoe for clearance with the firing pin safety latch. Reliability can be influenced by the bolt carrier group and gas system, sometimes necessitating adjustments or thorough cleaning.

Chapters

  1. 00:00Disclaimer and Introduction
  2. 00:29Shooting the HK MR762 with FRT
  3. 01:47HK MR762 Assaulter Build Overview
  4. 03:05Reliability and Troubleshooting FRTs
  5. 04:03Trigger Options and Modifications
  6. 06:34Ergonomics and Furniture Critique
  7. 08:05Conclusion and Future Testing

Frequently Asked Questions

What is an FRT trigger and how does it perform on an HK MR762?

An FRT (Forced Reset Trigger) allows for a very high rate of semi-automatic fire. On an HK MR762, it can effectively create a 'battle rifle at home' experience, though reliability may require tuning the gas system or ensuring the bolt carrier group is clean.

Are there any special considerations when installing an AS Designs Arcfire trigger on an HK MR762?

Yes, the trigger shoe on aftermarket triggers like Geissele or Mil-Spec may need to be cut to clear the HK's proprietary firing pin safety latch. The AS Designs Arcfire is noted for surprising reliability once installed correctly.

What are common reliability issues with FRTs on HK MR platforms?

A common issue involves the semi-auto cut bolt carrier not consistently pushing the trigger lever forward. This can be addressed by increasing the gas system's setting or ensuring the firearm is clean and well-lubricated.

What are the ergonomic drawbacks of the HK MR series mentioned in the video?

The video criticizes the proprietary HK stock and buffer tube, specifically noting the buttpad is very hard and the buffer tube prevents the use of standard aftermarket stocks, limiting customization options.

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