WMD Guns AR-15 / M16 5.56 / .223 Bolt Carrier Group

Top off your upper receiver build with the WMD GunsA(R) AR-15 / M16 5.56 / .223 Bolt Carrier Group. The case hardened 9310 steel bolt is magnetic particle inspected (MPI) with a high-performance extractor, ejector springs, gas rings, and special O-ring buffer combine for smooth and consistent operation. Further, the firing pin features heat-treated, hardened, and chrome steel construction while the carrier features heat-treated, and case hardened 8620 steel construction for superior strength and durability. The gas key is hardened to USGI Specifications and attached using grade 8 hardened fasteners to ensure smooth and proper cycling while the cam pin features heat treated and hardened steel construction for long-lasting dependability. To top it off, you can choose between a corrosion-resistant nickel boron coating or NiB-X black coating with both offering superior protection for this bolt carrier group.