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F1 AR15 Durabolt Nickel Boron Bolt Carrier Group

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The F1 DuraBolt NiB direct impingement full auto rated M16/M4 bolt carrier group, for use in AR15 platforms, is compatible with MIL-SPEC receivers and associated components. The DuraBolt NiB is enhanced with a Nickel Boron coating, which gives it a near 65 Rockwell in hardness for corrosion resistance and durability.


•Carpenter 158 bolt, ground after heat treat, MPI and HPT

•9310 steel carrier, ground after heat treat


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