Dirty Bird AR-15 5.56/.223/300BLK Bolt Carrier Group - Polished Nickel Boron

SKU# D112 | by Dirty Bird Industries
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The Dirty Bird Industries Nickel Boron Bolt Carrier Group is a substantial upgrade from a standard BGC. Its NiB coating reduces friction on sliding surfaces and prevents carbon build-up making cleaning a much easier task. The NiB coating offers great heat dissipation, allowing reduced wear on the BCG and interacting parts, to further prolong the lifespan of the unit. MIL-SPEC dimensions ensure correct component function and reliability.


  • Machined from 8620 tool steel (carrier) and 9310 carpenter steel (bolt)
  • Forward assist serrations
  • Shrouded firing pin
  • Nickel boron coating inside and out (bolt, carrier, and gas key)
  • Forged MIL-SPEC gas key attached with grade 8 hardware and properly staked.
  • 5.56 NATO bolt is shot peened and magnetic particle inspected
  • MIL-SPEC extractor spring, black extractor insert, Viton O-ring
  • Tool steel extractor
  • Weight 11.52 oz


Backed by the Dirty Bird Industries Lifetime Warranty

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