Rise Armament AR-15/M-16 Bolt Carrier Group BCG 5.56/.223 NiB. These Bolt Carrier Groups by RISE Armament reduce friction and increase the smoothness of each shot with high-quality steel parts a heat-treated carrier and a Grade 8 hardened gas key. The RISE Armament AR-15/M-16 BCG is individually MPI tested for quality so you can be confident you're getting an overall improved performance. Choose the RISE Armament Advanced Bolt Carrier Group BCG for a great new addition to your rifle. Specifications for RISE Armament AR-15 Bolt Carrier Group (BCG): Manufacturer: RISE Armament Fabric/Material: 9310 Steel 8620 Steel Carrier Material: 8620 Steel Bolt Material: 9310 Steel Caliber: .223 Remington 5.56x45mm NATO Gun Make: AR Platform Gun Model: M16 AR-15 Weight: 0.82 lb Condition: New Country of Origin: USA Features of RISE Armament Rifle Bolt Carrier Group BCG 2AL-BCG-RABCG: 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 Package Contents: RISE Armament Advanced Bolt Carrier Group 2AL-BCG-RABCG What firearm models does the manufacturer say RISE Armament AR-15 Bolt Carrier Group (BCG) is compatible with? The manufacturer suggests that RISE Armament AR-15 Bolt Carrier Group (BCG) is compatible with AR-15 M16Rise Armament RA-1011-SLVR: AR-15/M-16 Bolt Carrier Group 5.56/.223 NiB