FN AR-15 Barrel 20" 5.56 NATO M16 Profile Rifle Length Gas System, Black Phosphate - 20100043

FN AR-15 barrel chambered in 5.56 NATO with a 20" length, M16 profile, and rifle length gas system. The barrel features button rifled construction with 1:7 twist rate, chrome-lined bore, and black phosphate finish. Manufactured from chrome moly vanadium steel per Mil-B-11595E, each barrel is high pressure tested and magnetic particle inspected for quality assurance.