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| Description | Premium quality Nickel Boron 5.56 Bolt Carrier Groups These are the best you'll find on the market and fully polished prior to nickel boron coating. Features: MPI Bolt (magnetic particle... | Black Nitride Bolt Carrier Group with MPI Bolt Features: MPI Bolt (Magnetic Particle Inspected) Carpenter 158 steel bolt (black nitride) Shot peened firing pin Grade 8 hardened... |
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