HK

The MR556A1 is a direct descendant of the world-famous HK416. It offers the civilian semi-automatic shooter battlefield-proven reliability, durability and precision you would expect from Heckler & Koch. This latest update to the MR556A1 includes an updated grip and forearm as well as a lighter barrel profile that removes nearly a pound of front-end weight from the rifle. 

The MR556A1 is assembled in the USA using US- and German-made components and uses many of the same parts and assemblies developed for the HK416. Like the HK416, the MR556A1 uses a proprietary HK short- stroke gas piston in place of the direct-gas-impingement system found on lesser AR15-style rifles that propels exhaust gas into the upper receiver to operate the action. In the “closed” HK piston system, exhaust gasses never enter the receiver, which means the HK runs cooler, cleaner. That is where that legendary HK reliability comes from.

Brand HK
Category Tactical Rifles
Caliber 5.56x45mm NATO
Model MR556
Series A1
Stock Finish Black
Action Semi-Auto
Barrel Length Range 16" to 16.99"
Sights None, Optic Ready
Capacity 30+1
Magazine Type OEM
Grips Black Polymer
Hand Right
Handguards M-LOK
OAL 33.90"-37.68"
Receiver Finish Black
Receiver Material Aluminum
Stock Description Adjustable
Stock Finish Group Black
Stock Material Synthetic
Twist 1:7"
Weight 8.60 lbs
Barrel Description Medium Contour