The Diamondback Firearms DB15 Combo is a semi-automatic AR-pattern rifle package designed around interchangeable 5.56 NATO and .300 Blackout configurations. Both barrels measure 16 inches, while the black hard-coat anodized receiver set and adjustable Magpul MOE stock provide a durable, familiar platform for range use, training, and recreational shooting. A flat-top receiver with an optic mounting rail supports the addition of a compatible red dot sight or riflescope.

Key features

• Interchangeable 5.56 NATO and .300 Blackout configurations provide versatile ammunition options
• Two 16-inch barrels support balanced handling and practical range performance
• Semi-automatic operation with 30+1 capacity supports efficient target practice
• Black hard-coat anodized receiver finish helps resist wear from regular use
• Adjustable Magpul MOE stock allows the length of pull to be tailored to the shooter
• Flat-top optic mounting rail makes the rifle ready for a compatible sighting optic

The DB15 Combo delivers a flexible AR-pattern rifle platform with two popular chamberings in one package.