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Stag Arms – 16″ 5.56 M4 Barrel (1/9 twist) Nitride$93.95This 16" Barrel is ready to install on any .223 or 5.56 upper receiver. The barrel features a 5.56 NATO chamber for both commercial and military ammunition. The 1/9 twist is perfect for stabilizing light weight projectiles. It is made from 4140 steel, that has been treated with a QPQ salt bath Nitride. The Nitride provides corrosion resistance while increasing surface hardness. The barrel has a government profile which includes an M203 cut for reduced weight and maximum utility. The Barrel extension is pre installed and headspaced from the factory.