AR15 / M16 Barrel – 11.5″ Government Carbine 1:7Our barrels are produced in house, from raw bar stock to finished product. All of our barrels are properly stress relieved after rifling, and extensions are torqued after nitride. Our quality control system ensures that all barrels are dimensionally correct and bores fall well within their individual tolerance.  Backed by our Satisfaction Guarentee.11.5″ length5.56 NATO ChamberCarbine length gas system1:7 RH twist4150 Chromoly Vanadium SteelStress relieved after riflingBlack Nitride finish by H&MM4 extension.075″ gas portWeight: 21.6 ounces100% USA Made