Aero Precision Aprh308186 308 Win 7.62x51mm NATO BCG M5 Platform Nitride

The Aero Precision APRH308186 Complete 308 Win 7.62x51mm NATO Black Nitride Steel M5 Platform Bolt Carrier Group delivers a precision-engineered firing mechanism for big-bore rifle builds, blending reliability with multi-caliber versatility for AR-308 compatible uppers and rifles. This complete BCG is finished in advanced black nitride to reduce friction, minimize lubrication needs, and simplify maintenance, while MPI and HPT testing ensure dependable performance under demanding conditions. The carrier is machined from 8620 tool steel with a 9310 bolt, and the gas key is 4130 steel secured with grade 8 hardware that's properly staked, providing robust durability for demanding applications. Firing pin is machined from 8740 steel with a high chrome coating, and forward assist serrations add functional utility. The bolt components are case hardened 9310 steel, shot peened, black nitride coated, with a precision ground external surface and a reduced firing pin hole diameter for accurate timing. Multi-caliber compatibility supports .308, 7.62x51, .338 Federal and other .308-based cartridges, while laser-engraved Aero Precision branding adds a touch of distinction to a proven, ready-to-install complete BCG.