HK Rifles are the new standard among commercial assault rifles. Created from years of research, these battlefield-tested rifles offer supreme performance. The MR556A1 features a proprietary gas piston operating system with a solid “pusher” rod, free floating rail system handguard, four picatinny rails, cold hammer forged German-made barrel, two-stage trigger, and a retractable buttstock. The civilian semi-automatic MR762A1 features a proprietary operating system with a solid operating “pusher” rod, cold hammer forged barrel, adjustable buttstock, ergonomic pistol grips, mechanical sight, free-floating four-quadrant rail system, and ambidextrous operating controls.