The left-handed F-1 Firearms DuraBolt Silver direct impingement full auto rated M16/M4 bolt carrier group, for use in AR15 platforms, is compatible with left-handed receivers and associated components.
- For Left-handed Uppers
- Carpenter 158 bolt, ground after heat treat, MPI and HPT
- 8620 steel carrier, ground after heat treat
- Due to current demand, please allow up to 30 days for shipment