BCM Bolt Carrier Group (MPI) - AutoMilspec Carpenter No. 158 steel HPT Bolt (High Pressure Tested Proof) MPI Bolt (Magnetic Particle Inspected) Shot Peened Bolt Chrome Lined Carrier (AUTO) Chrome Lined Gas Key Gas Key Hardened to USGI Specifications Stripped carrier is finished in an Ion Bonded Flat Dark Earth. Lowers friction and cleans easier. BCM (MPI) complete bolt carrier group is fully assembled. (BCG) Bolt carrier group (auto version) for your AR15, M16, or M4. Parkerized
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