HK MR556 SBR (Civilian HK416)

Published on August 3, 2016
Duration: 5:55

This guide details the customization of an HK MR556 SBR to mimic an HK416D, focusing on the short-stroke piston system, furniture features, and accuracy testing. Instruction is provided by an expert with high authority, covering technical aspects of the build and firearm mechanics.

Quick Summary

The HK MR556 SBR, customized to mimic an HK416D, features a 10-inch barrel and a reliable short-stroke piston system. Accuracy testing with standard M193 ammunition yielded groups of 1.6-1.7 MOA at 100 yards. The build also incorporates specialized HK magazines and furniture with storage, adhering to NFA regulations for SBRs.

Chapters

  1. 00:00Introduction and Project Overview
  2. 00:50Furniture and Storage
  3. 01:16Magazine Features
  4. 01:34Iron Sights
  5. 02:15Piston System and Handling
  6. 03:22Slow-Motion Piston Operation
  7. 04:08Accuracy Testing
  8. 05:12Results and Conclusion

Frequently Asked Questions

What are the key features of the HK MR556 SBR build discussed in the video?

The build focuses on customizing an HK MR556 SBR to resemble an HK416D, featuring a 10-inch barrel, a short-stroke piston system, HK E1 stock with storage, and specialized magazines. Accuracy testing indicated 1.6-1.7 MOA performance.

How does the short-stroke piston system on the HK MR556 compare to other designs?

The short-stroke piston system, similar to the G36, is highlighted for its reliability and cleaner operation. It's noted that the rifle handles similarly to an AR-15 but can feel slightly more front-heavy due to the piston assembly.

What accuracy can be expected from a customized HK MR556 SBR?

Based on testing with standard M193 55-grain ammunition at 100 yards using a Trijicon ACOG, the rifle typically achieves groups between 1.6 and 1.7 MOA. This demonstrates consistent precision for its configuration.

What are the regulatory considerations for an HK MR556 SBR build?

Building an SBR involves NFA regulations, requiring registration with the ATF and a $200 tax stamp. Magazines marked 'RESTRICTED LAW ENFORCEMENT/GOVERNMENT USE ONLY' also indicate specific usage limitations.

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