Description
This Bolt Carrier Group comes fully assembled by St. Croix Tactical for your AR15, M16, or M4.
Nickel Boron
9310 Steel Bolt
MPI Bolt (Magnetic Particle Inspected)
Shot Peened Bolt
Grade 8 Hardened Fasteners
Key Staked per Mil-Spec
Black Extractor Insert
Crane O-Ring
Free Shipping
Anyone have any experience with these?