All the major components have been QPQ Nitride treated (Carrier, Bolt, Extractor and gas key). Slicker and harder surface with 70 RC hardness. MPI tested and shot peened 9310 steel bolt. 8620 Steel Carrier. Requires very little lubrication and has a very slick surface. Easier to clean. Side staked gas key with grade 8 fasteners. Compatible with DPMS, CMMG & POF pattern rifles. from Sunny State Outdoors (Product SSOAIM308N)

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