Rise Armament Rise Bolt Carrier Assembly .308 Win Black. The .30 caliber BCG is compatible with calibers such as .308 and 6.5 Creedmoor. All are individually inspected to ensure high-level performance. Be sure to check out all of the RISE Armament products and Bolt Carrier Groups here at OpticsPlanet Black nitride finish 7.62 NATO &/or .308 Winchester drop-in ready. Specifications for RISE Armament Bolt Carrier Assembly .308 Win Black: Manufacturer: RISE Armament Color: Black Finish: Black Nitride Fabric/Material: 8620 Steel 9310 Steel Carrier Material: 8620 Steel Bolt Material: 9310 Steel Caliber: .308 Winchester Gun Model: AR-10 Hand: Right Weight: 0.9 lb Country of Origin: USA Features of RISE Armament Bolt Carrier Assembly .308 Win: 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 Package Contents: Rise Armament Rise Bolt Carrier Assembly .308 Win Black What firearm models does the manufacturer say RISE Armament Bolt Carrier Assembly .308 Win Black is compatible with? The manufacturer suggests that RISE Armament Bolt Carrier Assembly .308 Win Black is compatible with AR-10Rise Armament Rise Bolt Carrier Assembly .308 Win Black