The Diamondback DB15 is an AR-pattern semi-automatic rifle chambered in .300 Blackout with a 16-inch barrel. It has a Burnt Bronze Cerakote finish over an aluminum receiver with a Picatinny rail, and a black synthetic stock. Capacity is 30+1 rounds. 
 

Key Specifications 

• Brand: Diamondback 
• Model: DB15 
• Caliber: .300 Blackout 
• Action: Semi Auto 
• Capacity: 30+1 rounds 
• Barrel Length: 16 inches 
• Color/Finish: Burnt Bronze Cerakote 
   

Detailed Features 

• 16-inch barrel 
• Burnt Bronze Cerakote finish 
• Picatinny rail aluminum receiver 
• Black synthetic stock 
• 30+1 round capacity

Owners of the Diamondback DB15 in .300 Blackout often mention the contrast between the Burnt Bronze Cerakote and the black stock as part of the buy decision. The 16-inch barrel keeps the rifle in standard rifle configuration while remaining practical for most uses.

Function with both supersonic and subsonic .300 Blackout loads gets positive reviews, though a few owners report needing a heavier buffer when running subsonic loads exclusively. The Picatinny rail makes optics mounting straightforward and eliminates the need for a separate rail purchase.

Build quality draws mixed opinions. Some owners find the DB15 a solid AR-pattern rifle that delivers on value; others note fit and finish details that reflect the price tier. The Burnt Bronze Cerakote finish holds up well in general use per most owner accounts.