IN STOCK & AVAILABLE FOR IMMEDIATE SHIPMENT! This Heckler & Koch MR556-A1 is a semi-auto rifle which fires the 5.56mm round. It is blued with a 16-1/2" free-floating barrel. This brand new rifle has a gas piston operating system, a two-stage trigger, a free floating rail system handguard with four MIL-STD Picatinny rails and has a Picantinny rail machined into the top of its upper receiver. It has a retractable buttstock which can be locked into a solid, non-moving position by tightening an Allen screw in the bottom of the stock. Special target rifle takedown pins ensure the upper and lower receivers are firmly mated for accurate performance. This rifle comes with removable sights, one 30-round magazine, and a hardcase.