The Diamondback DB15 is an AR-pattern pistol chambered in .300 AAC Blackout with a 10-inch threaded barrel and M-LOK handguard. It ships with an SBA5 pistol brace and a 30-round magazine, in a Flat Dark Earth finish. 
 

Key Specifications 

• Brand: Diamondback 
• Model: DB15 
• Caliber: .300 AAC Blackout 
• Action: Semi Auto 
• Capacity: 30rd 
• Barrel Length: 10 inches 
• Color/Finish: FDE (Flat Dark Earth) 
   

Detailed Features 

• 10-inch threaded barrel in a short-barreled pistol configuration; transfer requires additional federal paperwork if assembled as a rifle 
• SBA5 pistol brace included 
• M-LOK handguard for accessory attachment 
• 30-round magazine included 
• Flat Dark Earth finish throughout

Owners of the DB15 in .300 AAC Blackout consistently point to the platform's reliability and Diamondback's solid build quality as the main draws. The pistol-length gas system on a 10-inch barrel runs consistently suppressed or unsuppressed, and most owners report no break-in issues.

The threaded barrel and SBA5 brace are practical additions that owners appreciate. The FDE finish is popular for its aesthetics and holds up well in field use. A few owners mention the muzzle blast in the 10-inch configuration is substantial indoors without a suppressor.

Value perception on the DB15 is generally favorable for the price tier. The Diamondback name doesn't carry the same cache as some premium AR builders, so opinions on aftermarket support are mixed, but basic parts compatibility with standard AR-15 components is a plus.