The Diamondback DB Barrel (brand part number DB556P7H50B8-R) is a 7-inch, 5.56x45mm NATO barrel built to replace a worn barrel or finish a pistol-length AR build. Diamondback machines it from 4150 chrome moly vanadium steel and finishes it in black nitride for corrosion resistance and long service life. A 1:8-inch twist rate stabilizes a wide range of 5.56 bullet weights, and the barrel is cut for a pistol-length gas system to match the shorter tube. It’s a direct, drop-in option for anyone building or rebarreling a 7-inch AR pistol.

Key Specifications

• Chambered in 5.56x45mm NATO.
• Measures 7 inches long.
• Cut with a 1:8-inch twist rate.
• Built for a pistol-length gas system.
• Machined from 4150 chrome moly vanadium steel.
• Finished in black nitride.

Frequently Asked Questions

What gas system does this barrel use? Pistol-length, matching the 7-inch barrel length.

What twist rate does it have? 1:8 inch, which stabilizes a wide range of 5.56 bullet weights.

What’s it made from? 4150 chrome moly vanadium steel, finished in black nitride.

Buy the Diamondback DB Barrel, 5.56x45mm NATO, 7-Inch Pistol-Length, Black Nitride

Finish your pistol-length build or replace a worn barrel with a genuine Diamondback part. Order the Diamondback Firearms barrel from our AR barrels selection at our Lubbock, Texas gun shop for fast, direct shipping.