Diamondback 308M135M50B10 OEM Replacement 308 Win 13.50" Mid-Length Black Nitride 4150 Chrome Moly Vanadium Steel Replace Your Barrel, Or Finish Your Build With This 13.50" Black Nitride Barrel From Diamondback! Made Of 4150 CMV With a Mid-Length Gas System. Length: 13.50" Model: OEM Replacement Finish: Nitride Barrel Type: Midlength Medium Profile