Diamondback DB Barrel Features The Diamondback DB Barrel is machined from 4150 chrome moly vanadium steel a material chosen for its combination of strength and heat resistance under sustained firing. Finished in black nitride rather than standard phosphate the barrel gains added corrosion resistance and a harder wearing surface both inside the bore and on the exterior. At 18 inches with a rifle-length gas system and a medium profile the barrel is built to balance weight savings with the rigidity needed for consistent accuracy across a range of .308 Win loads. A 1:10 inch twist rate stabilizes the full range of common .308 Win bullet weights from lighter varmint-style loads up through heavier match and hunting projectiles. Chambered specifically in .308 Win this barrel is intended to replace a worn factory barrel or serve as the barrel for a from-scratch AR-10 pattern build. The rifle-length gas system is a deliberate design choice on an 18 inch barrel providing softer more controlled cycling compared to shorter gas system lengths which reduces felt recoil and stress on the action over a high round count. Diamondback s use of 4150 CMV steel reflects a proven mil-spec-adjacent material choice rather than a budget alternative giving builders confidence in the barrel s long-term durability. For anyone finishing or repairing a .308 Win AR-pattern rifle this Diamondback barrel offers a durable accuracy-focused option in a common gas system length. Diamondback DB Barrel Specifications Brand: Diamondback Model: DB Barrel Caliber: .308 Win Barrel Length: 18 Barrel Type: Rifle Length Medium Profile Material: Chrome Moly Vanadium Finish: Nitride Color: Black Twist: 1:10 Available At: GrabAGun