2 Pack - AIM Phosphate Bolt Carrier Group 5.56 / .223 Chrome Lined MPI
2 Pack - 2 AIM Bolt Carrier Groups. Made in the U.S.A! 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 Chrome Lined Carrier and Gas Key.
- Full 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!