F-1 Firearms DuraBolt direct impingement full auto rated AR10 bolt carrier group is compatible with DPMS spec large frame receiver sets and associated components.
- DLC Coated
- Carpenter 158 bolt that is ground after heat treat
- 8620 Steel Construction
F-1 Firearms DuraBolt direct impingement full auto rated AR10 bolt carrier group is compatible with DPMS spec large frame receiver sets and associated components.