Bear Creek Arsenal BC-15 .223 Wylde Upper 18" 416R SS Heavy Barrel 1: 8 Twist Mid-Length Gas System 15" MLOK - $209.89 This BCA AR-15 complete .223 Wylde rifle length upper has an 18" heavy barrel with a 416R stainless finish, and features a 1: 8 twist rate, with a mid-length gas system. It includes