Manufactured by Defense Industrial Base suppliers to WMDs exacting specifications to provide the best BCG available, these BCGs are specifically engineered for NiB-X nickel boron coating to provide long life, high reliability and easy cleaning and maintenance. The BCG components are coated and polished to reduce fouling adherence. Coating is guaranteed for life against chipping, spalling or flaking. Over 30K rounds in Government protocol endurance testing did not wear the coating off. Especially beneficial in short barrel setups and suppressed platforms.Features :7.62x39NiB-X coatingBolt Case hardened 9310, shot peened, magnetic particle inspectedExtractor Manufactured, heat-treated, and hardenedFiring Pin Manufactured, heat-treated, hardened, chromed and certified per Government drawingsGas Key Hardened to USGI specifications and attached using grade 8 hardened fastenersCam Pin Manufactured, heat treated, hardened and certified per government drawingCarrier M4/16 style full auto (heavier) functions in AR15 and M4/16 platforms, 8620 material, heat treated and case hardened