The Diamondback DB Barrel (brand part no. DB300P10H50B8-R) is a 10-inch .300 Blackout barrel built for pistol-length AR builds and finish-your-own projects. Machined from 4150 chrome-moly-vanadium steel and finished in black nitride for corrosion resistance and easy cleanup, it’s cut with a 1:8-inch twist rate suited to the full range of .300 Blackout bullet weights, from lightweight supersonic loads to heavier subsonic rounds. Whether it’s replacing a worn factory barrel or finishing out a new pistol-length build, this barrel gives builders a straightforward, drop-in option sized for a pistol-length gas system.

Key Specifications

• Chambered in .300 Blackout.
• 10-inch barrel length sized for pistol-length AR builds.
• Cut with a 1:8-inch twist rate suited to both supersonic and subsonic loads.
• Machined from 4150 chrome-moly-vanadium steel for durability.
• Finished in black nitride for corrosion resistance and easy cleaning.
• Sized for a pistol-length gas system.

Frequently Asked Questions

What gas system length does this barrel need? It’s cut for a pistol-length gas system.

Will this handle subsonic .300 Blackout loads? Yes, the 1:8-inch twist rate stabilizes the full range of .300 Blackout bullet weights, including heavier subsonic rounds.

What’s the barrel finished in? Black nitride over 4150 chrome-moly-vanadium steel.

Buy the Diamondback DB Barrel, .300 Blackout, 10in Pistol-Length

Finish your pistol-length .300 Blackout build with a durable, ready-to-run barrel. Order it from our Diamondback Firearms lineup, part of our AR15 barrels selection, at our Lubbock, Texas gun shop for fast, direct shipping.