Microbest C158 HPT/MPI 5.56 Bolt Carrier Group - Chrome

Microbest C158 HPT/MPI 5.56 Bolt Carrier Group - Chrome The Microbest Bolt Carrier Group is an excellent choice for any build. This drop-in AR-15 BCG features a corrosion-resistant hard chrome finish, MIL-SPEC dimensions, and a magnetic particle inspected Carpenter 158 steel bolt. Crafted from domestically sourced 8620 steel, the M16 cut carrier features a gas key secured by properly staked Grade 8 screws and made in the U.S.A. Features .233/5.56 NATO Hard chrome 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 Proudly made in the U.S.A.