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Using the HK proprietary gas piston system found on the HK416 and G36, the MR556 does not introduce propellant gases and carbon fouling back into the rifle's interior, making it the most reliable of any AR-type firearm.
The MR556 uses many of the same assemblies and accessories originally developed for the HK416 including the HK . This is a MA complance firearm

This NEW HK handguard system allows all current accessories, sights, lights, and aimers used on M4/M16-type weapons to be fitted to the MR rifles.

The HK rail system can be installed and removed without tools and returns to zero when reinstalled.

Additionally, subassemblies like the MR556A1s upper receiver will be fully interchangeable with other high quality AR-style firearms.

The MR556 uses a barrel produced by Heckler Koch's famous cold hammer forging process. Has MUZZEL break installed
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