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.