JL Billet Bolt Carrier Group 5.56 Black Nitride Black

JL Billet Bolt Carrier Group 5.56 Black Nitride Black. 56 MPI Bolt (Magnetic Particle Inspected) Carpenter 158 steel bolt (black nitride) Shot peened firing pin Grade 8 hardened fasteners 8620 heat treated carrier polished w/black nitride coating Key staked per Mil-Spec Package Contents: JL Billet Complete Bolt Carrier Group (BCG) 5.56 Which weapon models is JL Billet Bolt Carrier Group compatible with? JL Billet Bolt Carrier Group is compatible with AR-15 AR-10JL Billet JLB-AR15-BCG-BN: Bolt Carrier Group 5.56 Black Nitride Black