Disassembly of the HK MR556A1

Published on July 17, 2011
Duration: 7:15

This expert-level guide details the disassembly and reassembly of the HK MR556A1 rifle, emphasizing the unique tools and procedures required. It highlights differences from the standard AR-15 platform, particularly in the bolt carrier group and takedown pin mechanisms. The video stresses the necessity of the specific HK disassembly tool for proper reassembly.

Quick Summary

Disassembling the HK MR556A1 requires specific tools like the L-shaped buttstock tool and the HK multi-tool. The takedown pins are spring-loaded and indented, necessitating the special tool for removal. The bolt carrier group is not interchangeable with standard AR-15 parts due to unique design differences.

Chapters

  1. 00:13Introduction to Disassembly
  2. 00:18Included HK Tool Set
  3. 00:36Buttstock Disassembly Tool Removal
  4. 01:06Removing Takedown Pins
  5. 01:52Handguard Removal
  6. 02:40Bolt Carrier Group and Gas Piston Removal
  7. 03:18Bolt Carrier Group Differences
  8. 03:55Firing Pin Removal
  9. 04:48Cam Pin and Bolt Removal
  10. 05:47Reassembly Challenges
  11. 06:35Tool Necessity for Reassembly

Frequently Asked Questions

What special tools are needed for HK MR556A1 disassembly?

Disassembly of the HK MR556A1 requires the specific L-shaped buttstock disassembly tool for takedown pins and the red HK-branded multi-tool set for handguard screws. These tools are essential due to the unique design of the rifle's components.

Are HK MR556A1 bolt carrier group parts interchangeable with AR-15 parts?

No, the HK MR556A1 bolt and carrier group has distinct differences from a standard AR-15. Components are not interchangeable, and attempting to mix parts can lead to malfunctions or damage.

How do you remove the takedown pins on an HK MR556A1?

The takedown pins on the HK MR556A1 are spring-loaded and indented. They must be pushed across using the specific L-shaped buttstock disassembly tool to separate the upper and lower receivers.

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