The Diamondback DB15 Obsidian Series is a semi-automatic AR-15-pattern rifle chambered in 5.56 NATO with a 16-inch barrel. It has a 7075-T6 aluminum receiver with a Jungle Green Cerakote finish and a black nitride barrel. The rifle ships with a 30-round magazine and uses Magpul CTR stock and MOE K2 grip. 
 

Key Specifications 

• Brand: Diamondback 
• Model: DB15 
• Caliber: 5.56 NATO 
• Action: Semi Auto 
• Capacity: 30 rounds 
• Barrel Length: 16 inches 
• Color/Finish: Jungle Green 
   

Detailed Features 

• AR-15-pattern semi-automatic rifle chambered in 5.56 NATO 
• 16-inch black nitride barrel 
• 7075-T6 aluminum receiver with Jungle Green Cerakote 
• Magpul CTR stock and MOE K2 grip 
• Includes 30-round magazine

The Diamondback DB15 Obsidian Series attracts buyers who want a Magpul-equipped AR-15 with a factory Cerakote finish at a mid-tier price. The Jungle Green Cerakote gets positive feedback for its appearance and durability, and most owners appreciate that the Magpul CTR stock and MOE K2 grip come standard rather than as upgrades.

The black nitride barrel treatment is a point of interest for owners who have had chrome-lined alternatives. Opinions vary on which finish holds up better in wet conditions, but most DB15 owners report the barrel holds accuracy well after extended use. The 16-inch length is a practical standard for a general-purpose AR-15 that does not require additional paperwork.

The DB15's main criticism tends to be trigger quality. Most owners replace the stock trigger early, which they note offsets some of the value proposition. Customer service experiences with Diamondback are mixed in the community, with some owners reporting smooth warranty interactions and others describing delays.