FN Herstal barrels are prized among AR owners for their accuracy, dependability, and longevity. The Palmetto State Armory Sabre line has teamed up with FNH to create a 13.7" AR barrel exclusive to the PSA Sabre line that is made to the same standards of excellence the FN Herstal is known for. The PSA Sabre Series 5.56 13.7" CHF chrome-lined barrel by FNH is a proprietary blend of hammer-forged chrome-moly vanadium made by FN that is referred to as "Machine Gun Steel" by virtue of its use in FN's M249 and M240 weapons. The hammer forging process work hardens the steel, making it more durable. This 16" barrel is magnetic particle inspected, to ensure quality and dependability. Features: 5.56MM Caliber 1 in 7" Twist Cold Hammer Forged Chrome Moly Vanadium Steel Barrel; Chrome Lined