BCA BC-15 7.62x39 Right Side Charging Upper 18" Parkerized Heavy Barrel 1: 10 Twist Mid-Length Gas System 15" MLOK - $195.77 This BCA AR-15 complete 7.62x39 upper has an 18" heavy barrel with a parkerized finish, and features a 1: 10 twist rate, with a mid-length gas system. It includes a new style