This BCA AR-15 complete .45 ACP rifle has a 16" Government barrel with a parkerized finish, and features a 1:16 twist rate, and is a blowback system. It includes a 15" MLOK rail, an M4 flat-top billet upper receiver, a BCA bolt carrier group, a flash hider, and a right-side charging (Gen2) handle (patent protected), and the BC-45 lower. Uses Glock-style magazines. Magazine not included. Check out Magazines here!