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5.56 Durabolt Nickel Boron Polished (NiB) - Bolt Carrier Group

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0.73 LBS
$15.00 (Fixed shipping cost)

 Product Description

The F-1 Firearms 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
  • 8620 steel carrier, ground after heat treat

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