Product Description The WMD Guns NiB-X Bolt Carrier Group (BCG) for 7.62x39 is manufactured to WMD&&';;s exacting specifications and engineered around the NiB-X (nickel boron) coating for long service life, high reliability, and simplified cleaning. Coated and polished components help reduce fouling adherence, making this BCG especially beneficial for short-barrel setups and suppressed platforms. The NiB-X coating is guaranteed for life against chipping, spalling, or flaking, and has demonstrated durability through extensive endurance testing. Product Highlights NiB-X nickel boron coated and polished components help resist fouling and clean up faster. 7.62x39 bolt carrier group designed for reliable cycling and longevity. 9310 case-hardened bolt that is shot peened and magnetic particle inspected for durability. M4/M16-style full-auto carrier (heavier) built from 8620 steel, heat treated and case hardened. USGI-spec gas key secured with Grade 8 hardened fasteners for added strength and consistency. Specs Brand: WMD Guns Product Type: Bolt Carrier Group (BCG) Caliber: 7.62x39 Coating/Finish: NiB-X (nickel boron) Bolt: Case hardened 9310; shot peened; magnetic particle inspected Extractor: Manufactured, heat-treated, and hardened Firing Pin: Manufactured, heat-treated, hardened, chromed; certified per Government drawings Gas Key: Hardened to USGI specifications; attached using Grade 8 hardened fasteners Cam Pin: Manufactured, heat treated, hardened; certified per Government drawing Carrier: M4/M16 style full-auto (heavier); 8620 material; heat treated and case hardened Manufacturer Part Number: 1-NIBXBCG762x39 UPC: 855899003379 Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&&';;s manufacturer.