A direct descendant of the world-famous HK416, the MR556A1 is the commercial carbine from the same DNA. It offers the battlefield-proven reliability, durability and precision you would expect from a rifle that bears the name Heckler & Koch. 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 and more reliably. When adverse conditions, like dust, sand and mud are introduced, the advantage of the HK system becomes even more drastic. That is why so many of the worlds elite military and law-enforcement customers have absolute trust in their HKs.
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
Muzzle Muzzle Brake
Magazine Type OEM
Grips Black Polymer
Hand Right
Handguards M-LOK
OAL 37.68″
Rails Picatinny
Receiver Finish Black
Safety Manual
Stock Description Adjustable
Stock Finish Group Black
Stock Material Synthetic
Twist 1:7″
Weight 8.60 lbs
Barrel Description Medium Contour
Barrel Finish Black
Barrel Length 16.50″
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