TacFire Glock & Colt Mag Compatible Bolt Carrier Group BCG 45Acp Gen 2 Black BCG-45ACP-G2. 8 oz Bolt Material: 9310 Steel Carrier Material: 8620 Steel Country of Origin: USA Features of Tacfire 9MM/45ACP Bolt Carrier Group BCG 29U-BCG-NBCGC: Machined...