Stag Arms 10.5" 5.56 1:7 Gov CMV Barrel, Carbine Length (Chrome&Phos) The classic Stag AR-15 barrel chambered in 5.56 is everything you would expect in a compact barrel. Coming it at 10.5 inches in length with a carbine length gas system. Finished with the tried and true mil-spec phostphate coating and chrome lining, this barrel will give you years of service in your next pistol build or as a replacement barrel for your existing AR 15*Note: Barrels under 16" in length are only for use on AR-15 pistols, legal Short-Barreled Rifles (SBR), or must have a muzzle device permanently attached to bring the length to at least 16.