Heckler & Koch
MR556 A4 16.5” Upper Receiver Kit
The newest iteration of the HK416 for the commercial market. The MR556 A4 upper is a complete, drop-in ready upper kit compatible with milspec AR-15 lowers. The MR556 features an 16.5 inch cold hammer forged barrel with a lifetime replacement guarantee from HK, if you shoot it out from normal use and they will replace it. The MR556 A4 upper also comes equipped with an adjustable gas block allowing the user to adjust the gas for suppressed & unsuppressed use.
The MR556 A4 uppers utilized a closed piston operating system that eliminates malfunctions common on direct impingement systems as it prevents carbon fouling and waste gasses into the receiver / action area. This same system is responsible for the legendary reliability that the HK416 platform is known for.
What’s Included
1x HK MR556 A4 16.5” Complete Upper (With BCG and Charging Handle)
1x HK Tungsten Filled Proprietary Buffer
1x HK Propriety Buffer Spring
1x HK Soft Case
Specifications
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