CMC Barrels are precision made from premium components with input from law enforcement, military, and civilian shooters to bring you the best of the best in AR-15 barrel performance. Each barrel is rigorously inspected at multiple stages of the manufacturing process with precision tools that check straightness, uniformity, and tolerances down to .0001” or the barrel won’t ship. This 16” barrel is machined from 4150 Chrome Moly Vanadium Steel, black Nitride coated, and features a mid-length gas system for the ultimate reliability and durability.