Complete your custom gun build with an AR-15 barrel direct from Palmetto State Armory. This 10.5" inch barrel is made from high quality 4150 vanadium steel with a nitride finish. It is chambered in .300 AAC Blackout. Palmetto State Armory is dedicated to providing your build with the best in design, manufacturing and quality. Bring your custom build to life at Palmetto State Armory.