Diamondback DB15 .300 Blackout 10″ FDE Semi-Auto

The Diamondback Firearms DB15 is a semi-auto firearm chambered in .300 AAC Blackout. It features a 10-inch heavy 4150 Chrome Moly Vanadium barrel with a black nitride finish, a 9-inch M-LOK handguard, and an FDE finish with a Diamondback Carbon lower receiver.

Its configuration includes a pistol-length gas system, forged 7075-T6 aluminum receivers, a shot-peened and magnetic particle inspected Mil-Spec 8620 carrier, and a standard trigger.

Key Specifications

• The caliber is .300 AAC Blackout.
• The action is semi-auto.
• The barrel measures 10 inches and uses a heavy 4150 Chrome Moly Vanadium construction with a black nitride finish.
• The barrel twist rate is 1:8 inches.
• The gas system is pistol-length.
• The handguard provides a 9-inch M-LOK rail.
• The upper receiver is made from forged 7075-T6 aluminum.
• The lower receiver is made from forged 7075-T6 aluminum with Diamondback Carbon construction.
• The listed magazine capacity is 28+1.
• The firearm includes no sights and uses an A2 flash hider with a 5/8 x 24 thread specification.

With its compact barrel, M-LOK mounting interface, .300 AAC Blackout chambering, and practical controls, the DB15 offers a focused configuration for customers seeking a straightforward, adaptable semi-auto platform.

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