The Diamondback DB Barrel (M4 Contour) 5.56x45mm NATO 16" Black Nitride 4150 Chrome Moly Vanadium Steel delivers dependable performance for AR-15 builds, blending a carbine-length M4 profile with a 16" barrel to balance maneuverability and velocity. Crafted from 4150 Chrome Moly Vanadium steel and finished in a durable nitride coating, this barrel offers enhanced wear resistance and corrosion protection suitable for field and range use. Its 1:8" twist rate stabilizes a wide range of 55 to 77 grain ammunition, making it versatile for target shooting, varmint control, and mid-range engagements. The nitride finish reduces friction and simplifies maintenance, while the nitride-treated bore and chamber contribute to consistent accuracy and easier cleaning after extended shooting sessions. Designed for builders seeking a reliable, mid-length option that matches a standard carbine setup, this 16" DB Barrel supports a balanced gas system and proven chamber geometry for steady, repeatable performance. From precise grouping to steady follow-up shots, Diamondbacks DB Barrel is a solid foundation for crafting a dependable rifle platform that performs when it matters most.