This CMMG Complete Bolt Carrier Group is compatible with both 6.8SPC and .224 Valkyrie cartridges. The carrier, bolt, and extractor all have a phosphate finish that adds to longevity and corrosion resistance.

Manufacturer Part Number: 25BA49EBolt: 9310 Steel, Phosphate Finish, 6.8SPC/224 Valkyrie Bolt Carrier: 8620 Steel, Chrome Lined, Phosphate Finish Extractor: 4140 Steel, Phosphate Finish Weight: .9lbs