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

Published on December 31, 2025
Duration: 9:03

This video reviews the HK MR762 and MR556 platforms, specifically focusing on their performance with the AS Designs Arcfire forced reset trigger (FRT). The host, demonstrating high expertise, highlights the 'battle rifle at home' potential of the 13-inch .308 MR762, while also discussing reliability nuances with the FRT in the MR556, such as the semi-auto cut bolt carrier requiring specific gas settings. Ergonomic criticisms of the proprietary HK stock and buffer tube are also detailed.

Quick Summary

The HK MR762 and MR556 are reviewed with the AS Designs Arcfire FRT, showcasing their 'battle rifle at home' potential. Reliability issues with the MR556's bolt carrier are discussed, often requiring higher gas settings. Ergonomic drawbacks include proprietary stocks and buffer tubes preventing aftermarket use.

Chapters

  1. 00:00Introduction and Disclaimer
  2. 00:29Shooting the HK MR762 with FRT
  3. 01:47HK MR762 A4 'Assaulter' Build Overview
  4. 03:05MR556 Reliability and Arcfire Tuning
  5. 04:03Trigger Options and Modifications
  6. 06:34Ergonomics: Stock and Buffer Tube Issues
  7. 08:05Conclusion and Future Testing

Frequently Asked Questions

What is the main focus of the video regarding the HK MR762 and MR556?

The video focuses on the performance and reliability of the Heckler & Koch MR762 and MR556 platforms when equipped with the AS Designs Arcfire forced reset trigger (FRT), exploring their potential as 'battle rifles at home'.

What are the key technical challenges mentioned when using an FRT with the HK MR556?

A key challenge with the MR556 and FRT is the semi-auto cut bolt carrier, which may require a higher gas setting or thorough cleaning to ensure it pushes the trigger lever forward sufficiently for reliable function.

What ergonomic issues are highlighted with the HK MR platforms?

The host criticizes the proprietary HK stock and buffer tube, noting the buttpad's extreme hardness and the inability to use standard aftermarket stocks due to the proprietary tube design.

Are standard aftermarket triggers compatible with the HK MR series?

Both Geissele and Mil-Spec triggers require a modification to the trigger shoe to properly clear the firing pin safety latch on HK MR series firearms, indicating a need for gunsmithing.

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