A direct descendent of the HK416 the MR556A1 is a semi-automatic rifle developed by Heckler & Koch as a premium level commercial/civilian firearm with match rifle capability. Like the HK416 the MR556A1 is a major product improvement over conventional AR-type carbines and rifles. FEATURES: Retractable Buttstock; Piston Operating System; Cold Hammer Forged Barrel; Two-Stage Trigger FINISH: BLACK