The Battle Arms Development M4/M16 Standard BCG is a mil-spec bolt carrier group designed for reliable cycling in AR-15 and M16 platform rifles.
- Part Type: Bolt Carrier Group
- Compatible Firearms: AR-15, M16, M4
- Carrier Material: 8620 Steel
- Bolt Material: 9310 Steel, Shot-Peened
- Finish: Phosphate
- Installation: Drop-In
- Includes: Bolt, Carrier, Cam Pin, Firing Pin, Firing Pin Retaining Pin
