CMMG Inc Bolt Carrier Group BCG MK3 6.5 Creedmoor. 5 Creedmoor Bolt Carrier Group BCG. Features high pressure design to reduce primer cratering with high pressure loads. Bolt: 9310 Steel Phosphate Finish high pressure design. Carrier: 8620 Steel Chrome Lined Phosphate Finish. Extractor: S7 Tool Steel Phosphate Finish. Firing Pin: 17-4 Stainless Steel High Pressure design. Specifications for CMMG Inc 6.5 Creedmoor Bolt Carrier Group (BCG): Manufacturer: CMMG Color: Black Finish: Phosphate Fabric/Material: 9310 Steel S7 Tool Steel 8620 Alloy Steel 17-4 Stainless Steel Carrier Material: 8620 Steel Bolt Material: 9310 Steel Caliber: 6.5mm Creedmoor Gun Model: CMMG Mk3 Hand: Right Included Accessories: Extractor Carrier Bolt Firing Pin Package Contents: CMMG Inc 6.5 Creedmoor Bolt Carrier Group What firearm models does the manufacturer say CMMG Inc 6.5 Creedmoor Bolt Carrier Group (BCG) is compatible with? The manufacturer suggests that CMMG Inc 6.5 Creedmoor Bolt Carrier Group (BCG) is compatible with CMMG Mk3CMMG Inc 65BA4D6: Bolt Carrier Group Mk3 6.5 Creedmoor