The Diamondback DB15 Obsidian Series is an AR-15 pattern pistol chambered in 5.56 NATO with an 11.5-inch barrel and a carbine-length gas system. It ships with a 30-round magazine and an SBA5 brace, finished in black. The 11-inch M-Lok handguard gives the short barrel plenty of rail space for accessories. 
 

Key Specifications 

• Brand: Diamondback 
• Model: DB15 Obsidian Series 
• Caliber: 5.56 NATO 
• Action: Semi Auto 
• Barrel Length: 11.5 in 
• Capacity: 30+1 
• Color/Finish: Black 
   

Detailed Features 

• 11.5-inch barrel with carbine-length gas system 
• 11-inch M-Lok handguard 
• SBA5 pistol brace 
• 30-round magazine included 
• Black polymer grip

Owners of the DB15 Obsidian Series typically appreciate the compact package that the 11.5-inch barrel delivers for a short-range build. The M-Lok handguard draws consistent praise for layout flexibility, and most report the carbine-length gas system runs reliably with quality 5.56 NATO ammunition.

Ergonomics with the SBA5 brace generate mixed reactions. Some shooters find it a natural fit for a pistol-configuration AR build, while others would prefer a traditional stock on a dedicated range gun. Recoil with the short barrel is manageable but noticeably snappier than a full-length carbine.

Value perception for the Obsidian Series sits in the middle of the market. Buyers who compare it with budget AR pistols note Diamondback's finish quality as a positive, though the trigger is a common point of criticism and is the first part most owners look to upgrade.