The Diamondback DB .300 AAC Blackout barrel (brand part no. DB15P300-BARR10) is a 10-inch pistol-length AR-15 barrel with a heavy profile. Diamondback Firearms machines it from 4150 chrome moly and treats it with black nitride for corrosion and wear resistance. The 1:8 twist and button-rifled bore suit supersonic and subsonic .300 Blackout loads alike. It is a compact choice for short, handy builds and suppressed range guns.

Key Specifications

• Chambering is .300 AAC Blackout, built for compact barrels.
• Barrel length is 10 inches, which keeps the build short.
• The gas system is pistol-length, which fits a short barrel.
• The contour is a heavy profile for added stiffness and heat capacity.
• The material is 4150 chrome moly, a standard high-strength barrel steel.
• The coating is black nitride for corrosion and wear protection.
• Twist rate is 1:8, which handles both light and heavy .300 Blackout bullets.
• The muzzle is 5/8×24 threaded for muzzle devices and suppressor mounts.
• The bore is button rifled with a 6-groove profile for consistent accuracy.
• The barrel has M4 feed ramps and an 11-degree target crown.

Frequently Asked Questions

What thread does this barrel have? The muzzle is threaded 5/8×24.

What twist rate is it? The twist is 1:8.

What gas system does it use? It uses a pistol-length gas system.

Buy the Diamondback DB .300 Blackout 10-Inch Barrel

A 10-inch .300 Blackout barrel is the starting point for a small, handy carbine build. See our other AR-15 barrels as well. Order from our Lubbock, Texas gun shop for fast, direct shipping.