Dirty Bird AR-15 5.56/.223/300BLK Bolt Carrier Group – Phosphate/Crome-Lined

SKU# D127 | by Dirty Bird Industries
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The Dirty Bird AR-15 Bolt Carrier Group comes fully assembled and ready to be dropped in. The carrier body is machined from 8620 steel, heat treated, & MP inspected. The carrier's bore is hard chromed for increased corrosion resistance and reliability, per mil-spec. The bolt is machined from Carpenter 158 tool steel, shot peened to relieve stress, individually high-pressure tested and MP inspected. The bolt and carrier are both treated with a Mil-Spec phosphate coating for its durability and corrosion resistance. This Dirty Bird Phosphate Bolt Carrier Group features a gas key tube that is hard chromed and properly torqued and staked screws.


  • Machined from Carpenter Technology No. 158 alloy.
  • Heat treated
  • Shot peened per ASTM B851/SAE AMS2430S
  • Individually High Pressure Tested (test fired)
  • Individually Magnetic Particle Inspected
  • Manganese Phosphate Finish


  • Tool Steel Extractor
  • Manganese Phosphate Finish
  • Mil-Spec O-Ring


  • Machined from AISI 8620 aircraft quality alloy per ASTM A108/A322-13
  • Full Mass M16 Profile
  • Stress Relieved
  • Hard Chrome Bore

Gas Key

  • Machined from 4130 chromoly steel alloy per ASTM A108/A322-13
  • Grade 8 Hardware
  • Properly Staked
  • Hard Chrome Internal
  • Permatex sealed


Backed by the Dirty Bird Industries Lifetime Warranty!

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