DealFeatures: A case hardened 8620 steel carrier (M16 profile) with an advanced low friction NiB coating is the base for this BCG. A case hardened 4340 cam pin shot peened, case hardened 9310, and NiB coated bolt. The bolt is Mil-STD-1816 HPT and MPI tested (High Pressure Tested and Magnetic Particle Inspected) - may or may not be marked MP, depending on product batch. Includes a crane O-ring on the shot peened case hardened 4340 steel NiB coated extractor. A mil-spec firing pin made from centerless ground 8740 steel that is hard chrome, coated takes care of the primer ignition. Fully machined 4130 steel gas key, properly staked, and attached with grade 8 hardware. Made in the USA. from Granite Ridge Outfitters (Product AresNIBBCG556) |