This Rosco Manufacturing Bloodline 5.56 NATO barrel measures 16 inches in length and is constructed from 4150 chrome moly vanadium steel with a nitride finish. The 1:7" rate of twist enhances stability for a variety of bullet weights.Key FeaturesBarrel Length: The barrel measures 16 inches, ideal for maneuverability.Caliber: Designed for use with .223 Rem/5.56 NATO cartridges.Material: Made from 4150 CMV steel, providing strength and durability.Finish: Features a nitride treatment for corrosion resistance and improved longevity.Rate of Twist: The 1:7" twist rate accommodates a wide range of bullet weights.