NEW FRONTIER AR15 10.5" 1:7 5.56 BLKUpgrade your AR 15 platform with the New Frontier Armory 10. 5" 5. 56 NATO Barrel. This compact barrel is perfect for building a maneuverable pistol or short barreled rifle. Crafted from high quality 4140 chromoly steel with a durable black finish, it offers excellent corrosion resistance and longevity. The 1: 7 twist rate provides optimal stabilization for a wide range of 5. 56 NATO bullet weights, ensuring consistent accuracy. The barrel's compact