The Diamondback Firearms DB15 is a semi-automatic AR-15 pistol package designed around quick caliber changes. Its 5.56 NATO lower and 7-inch upper accept .223 Remington and are accompanied by a separate complete 10-inch .300 Blackout upper. Both uppers use chrome moly barrels with black nitride finishes, free-float M-LOK handguards, optics-ready flattop receivers, and A2 flash hiders. The forged aluminum receivers, direct gas impingement system, pistol buffer tube with foam pad, and Magpul pistol grip provide a familiar AR-15 setup for recreational shooting and lawful defensive use.

Key features

• Includes complete 5.56 NATO and .300 Blackout upper assemblies for convenient caliber changes
• 7-inch 5.56 NATO chrome moly barrel and 10-inch .300 Blackout chrome moly barrel
• Black nitride barrel finishes provide a durable, corrosion-resistant surface
• Free-float M-LOK handguards provide flexible accessory mounting options
• Optics-ready flattop upper receivers support compatible aiming optics
• Forged aluminum receivers and a mil-spec bolt carrier group provide a familiar AR-15 configuration

The Diamondback DB15 Multi-Caliber package combines two popular AR-15 pistol configurations in one versatile platform.