Rock River Arms Bolt Carrier Group

Rock River Arms 223/5.56 bolt carrier group (BCG). Phosphate coated. Full auto cuts. 8620 steel with chrome lined bore. Gas key and bolt is 158 Carpenter steel. Specifications for Rock River Arms Bolt Carrier Group: Manufacturer: Rock River Arms Color: Black Fabric/Material: Steel Cartridge: .223 Remington Features of Rock River Arms Bolt Carrier Group: Rock River Arms Bolt Carrier Group 223/556 NATO Carrier Package Contents: Rock River Arms Bolt Carrier Group