The Heckler & Koch Buffer Retainer is an essential replacement component designed for HK416 and MR762A1 rifle systems.Heckler & Koch Buffer RetainerCompatible with HK416 rifle systemsCompatible with MR762A1 rifle systemsCompatible with MR556 rifle systemsOEM quality replacement partThis genuine H&K component ensures proper buffer system function and maintains the reliability standards expected from Heckler & Koch firearms.