TacFire Bu-45ACP-7 Pistol Upper Assembly 45 ACP Caliber With 7" Black Nitride Barrel, Black Anodized 7075-T6 Aluminum Receiver For M-LOK Handguard For AR-Platform Includes Bolt Carrier Group Chambered In 45 ACP, This Pistol Upper Is Completely Built And Ready To Be Put On a Lower. Includes a Bolt Carrier Group. Type: Complete Caliber: 45 ACP Sights: None, Optic Ready Barrel Length: 7" Barrel Finish: Black Nitride Receiver Finish: Black Anodized Handguards: M-LOK Handguard Finish: Black Barrel Length Range: 7" To 7.99"