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!