This Bolt Carrier Group comes fully assembled by Texas Gun Builders for your AR15, M16, or M4.
- 5.56/.223
- 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
- 11.6oz
