2 AIM Nickel Boron BCGs .223 / 5.56 MPI 9310 M16 Profile Bolt Carrier Group

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2 Pack - AIM Nickel Boron Bolt Carrier Groups. Made in the U.S.A! Excellent Quality and Finish, MPI tested Mil-Spec BCGs, complete and ready to drop in. Ships out Priority Mail with tracking!

  • Shot Peened MPI (Magnetic Particle Inspected) Bolt. 
  • 9310 Bolt Material, 8620 Carrier and Gas Key. 
  • M16 Full Auto Profile Carrier
  • Properly staked Investment cast gas key hardened to USGI specifications 
  • Gas Key Fastened with Hardened Grade 8 Fasteners. 
  • Extractor O-Ring upgrade with Black Insert. 
  • Fast, free shipping!

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