The Diamondback DBB BBL 556 16" CARB MED 1/9 BLK is a high-performance Diamondback Barrels product designed for AR-15 platforms, pairing a medium profile 16" barrel with a reliable 1:9 twist for optimal stabilization of a wide range of 5.56x45mm NATO ammo. This 556NATO barrel features a carbine length gas system and a durable nitride finish in black, delivering corrosion resistance and easy cleaning without sacrificing accuracy. Built to enhance reliability in a versatile AR-15 rifle, its medium-profile design balances weight and rigidity for improved heat management during extended shooting sessions, while the 1/9 twist supports a broad selection of common projectiles. The combination of a 16" length and carbine gas system makes it especially suitable for mid-range engagements, sporting rifles, and duty or precision-oriented builds where consistent velocity and predictable barrel harmonics matter. Whether youre upgrading an existing AR-15 or assembling a long-range capable rifle, this Diamondback Barrel delivers dependable performance, precision alignment, and a clean, durable finish that stands up to field use, training, and competitive shooting.