Mud Test: H&K 416/MR556

Published on August 9, 2019
Duration: 9:03

This guide details the H&K MR556A1 mud test as performed by Karl Kasarda of InRangeTV. It covers two scenarios: a closed-action test where the rifle performs well, and an open-action test where it fails. The guide also includes techniques for clearing malfunctions, such as rinsing with water and 'mortaring' the rifle. Kasarda, a recognized expert in firearm reliability testing, provides an analytical assessment of the piston system's performance in extreme conditions compared to Direct Impingement systems.

Quick Summary

Expert Karl Kasarda of InRangeTV tested the H&K MR556A1's reliability in extreme mud conditions. With the dust cover closed, the rifle performed well. However, when mud entered the action with the dust cover open, the MR556A1 failed to cycle, suggesting Direct Impingement AR-15s might be more resilient to heavy fouling in such scenarios.

Chapters

  1. 00:00Introduction: H&K MR556A1 vs DI AR-15
  2. 02:11Mud Test: Dust Cover Closed
  3. 03:03Mud Test: Dust Cover Open
  4. 07:24Conclusion and Analysis

Frequently Asked Questions

How did the H&K MR556A1 perform in a mud test with its dust cover closed?

In the mud test with the dust cover closed, the H&K MR556A1 successfully fired five rounds of M193 ammunition without any malfunctions. This indicates that the rifle's sealed system effectively resists external mud when the action is properly closed.

What happened when the H&K MR556A1 was tested with mud and the dust cover open?

When mud was applied directly into the action with the dust cover open, the H&K MR556A1 experienced immediate failures to cycle and return to battery. It performed worse than standard Direct Impingement AR-15s previously tested under similar conditions.

What is the difference between the H&K 416 and the MR556A1?

The HK416 is the military designation for Heckler & Koch's rifle, while the MR556A1 is the civilian-legal variant available on the commercial market. They share the same core short-stroke gas piston operating system.

What is the 'mortaring' technique for clearing a rifle malfunction?

'Mortaring' a rifle involves forcefully and repeatedly cycling the charging handle. This technique is used to clear stubborn malfunctions, such as a stuck casing, by using the leverage of the stock against the ground or a solid surface.

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