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Lifetime Guarantee. NiB-X M16/AR-15 5.56 Full Auto Bolt Carrier Group, Faceted - POLISHED All WMD BCG components are manufactured by Defense Industrial Base suppliers to WMD's exacting specifications to provide the best BCG available. 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.
Bolt - Carpenter 158 heat-treated, shot-peened and magnetic particle inspected. Engineered from government drawings for NiB-X. Milspec gas rings. NiB-X coated (40% more wear-resistant than chrome).
Extractor - Manufactured, heat-treated, and hardened per government drawings. NiB-X coated.
Firing Pin - Manufactured, heat-treated, hardened, chromed and certified per Government drawings.
Carrier - M4/16 style full auto (heavier) functions in AR15 and M4/16 platforms, 8620 material, heat treated and case hardened. Manufacturing tolerances and surface finishes tightly controlled. NiB-X coated for durability and ease of cleaning. Faceted Style.
Gas Key - Hardened to USGI specifications and attached using grade 8 hardened fasteners. Permatex No. 3D Aviation Form a gasket Type III Sealing Compound per MIL-S-45180 used on assembly. NiB-X coated. Staked per military specifications.
Cam Pin - Manufactured, heat treated, hardened and certified per government drawings. NiB-X Coated.