Grendel Hunter 6.5 Grendel / 6mm ARC / .22 ARC Bolt Carrier Group 8620 Steel Carrier 4130 Steel Gas Key with Grade 8 fasteners (Staked) 4140 Steel Cam Pin M16 Auto Profile 6.5 Grendel Type II (.136) / 6mm ARC / .22 ARC Bolt – 9310 Steel (Shot Peened) Black Nitride Mil-spec Gas Rings MPI Hard Chrome Firing Pin Sound Mitigation Buffer ™- SMB ™ GEN3 – H2 (4.7oz) The Armaspec Gen3 Sound Mitigation Buffer™ SMB ™ is a single-stage drop-in replacement for your standard buffer and spring. The Sound Mitigation Buffer ™ is designed to keep the buffer spring from rubbing against the inner wall of the buffer tube providing smooth, quiet operation.
