CMMG Bolt Carrier Group BCG 224 Valkyrie Steel Phosphate Finish Black. 8 SPC/.224 Valkyrie bolt and carrier sets do yourself a favor and pick up this CMMG Inc 6.8 SPC/.224 Valkyrie Complete Bolt Carrier Group. CMMG constructed these Bolt Carrier Groups from phosphate-finished 8620 steel and they are chrome-lined to greatly reduce the risk of internal damage that could potentially occur with other components. The CMMG 6.8 SPC/.224 Valkyrie BCG is incredibly durable and is ready to handle the immense recoil your weapon produces. Plus the phosphate finish extends the lifetime of this part making it a crucial component for long-lasting use. Equip a CMMG 6.8SPC/.224 Valkyrie BCG for your weapon build to ensure smooth operation with premium components. Specifications for CMMG 6.8 SPC/.224 Valkyrie Complete Bolt Carrier Group (BCG): Manufacturer: CMMG Color: Black Finish: Phosphate Fabric/Material: Steel Carrier Material: 8620 Steel Bolt Material: 9310 Steel Caliber: .224 Valkyrie Gun Make: AR Platform Gun Model: AR-15 Features of CMMG Inc 6.8 SPC/.224 Valkyrie Complete Bolt Carrier Group BCG: Bolt: 9310 Steel Phosphate Finish 6.8SPC/224 Valkyrie Bolt Carrier: 8620 Steel Chrome Lined Phosphate Finish Extractor: 4140 Steel Phosphate Finish Weight: .9lbs Package Contents: CMMG 6.8 SPC/.224 Valkyrie Complete Bolt Carrier Group (BCG) What firearm models does the manufacturer say CMMG 6.8 SPC/.224 Valkyrie Complete Bolt Carrier Group (BCG) is compatible with? The manufacturer suggests that CMMG 6.8 SPC/.224 Valkyrie Complete Bolt Carrier Group (BCG) is compatible with AR-15CMMG 25BA49E: Bolt Carrier Group BCG 224 Valkyrie Steel Phosphate Finish Black