Rise Armament, Bolt Carrier Group, .223/5.56, Black Finish
- High-strength and easy-to-clean black nitride finish
- Individually MPI tested
- Bolt: 9310 MPI tested
- Carrier: 8620 tool steel heat treated and case hardened
- Gas key: tool steel – grade 8 hardened fasteners and staked properly
- Cam pin: 4140 steel
- Extractor: tool steel – shot peened
