Microbest C158 HPT/MPI 5.56 Bolt Carrier Group - Black Nitride

The Microbest Bolt Carrier Group is a great choice for any build. This drop-in AR-15 BCG features a corrosion resistant salt bath nitride finish, MIL-SPEC dimensions, and a magnetic particle inspected carpenter 158 steel bolt. Crafted from domestically sourced 8620 steel, the M16 cut carrier includes a gas key fastened by properly staked grade 8 screws. Made in the U.S.A. and covered by a lifetime warranty, you can count on this BCG for a lifetime of service. Features: .233/5.56 NATO Salt bath nitride finish M16 cut Aircraft quality 8620 steel carrier 4130 steel gas key Properly staked grade 8 gas key screws Carpenter 158 steel bolt 4140 steel extractor MIL-SPEC O-ring MIL-SPEC gas rings 4140 steel cam pin 8740 steel firing pin with hard chrome finish Magnetic particle inspected Lifetime warranty Proudly made in the U.S.A.