Watchtower Firearms Durabolt 7.62 Nato Bolt Carrier Group BCG Black. 62 BCG direct impingement full auto rated AR10 Bolt Carrier Group BCG is compatible with MIL-SPEC receivers and associated components. The DuraBolt is enhanced through Chemical Vapor Deposition (CVD) technology and is the hardest smoothest and most wear resistant carrier group available. The DuraBolt offers the lowest coefficient of friction on the market at .01 after our micro finishing process. Specifications for Watchtower Firearms Durabolt 7.62 Bolt Carrier Group (BCG): Manufacturer: Watchtower Firearms Caliber: 7.62x51mm NATO Gun Model: AR-10 Condition: New Country of Origin: USA Features of Watchtower Firearms Durabolt 7.62 Bolt Carrier Group BCG: Carpenter 158 bolt ground after heat treat MPI and HPT 9310 steel carrier ground after heat treat Package Contents: Watchtower Firearms Durabolt 7.62 Bolt Carrier Group What firearm models does the manufacturer say Watchtower Firearms Durabolt 7.62 Bolt Carrier Group (BCG) is compatible with? The manufacturer says that Watchtower Firearms Durabolt 7.62 Bolt Carrier Group (BCG) is compatible with AR-10Watchtower Firearms DB-762-TB-TTZ: Durabolt 7.62 Nato Bolt Carrier Group BCG Black