The Diamondback DB15 Obsidian is a semi-automatic AR-pattern rifle chambered in 6mm ARC with an 18-inch black nitride medium taper threaded barrel. The aluminum receiver has a black hardcoat anodize finish with a Picatinny rail, paired with a Magpul CTR stock and Magpul MOE K2 grip. It ships with a 26-round magazine and a 15-inch M-LOK handguard. 
 

Key Specifications 

• Brand: Diamondback 
• Model: DB15 Obsidian 
• Caliber: 6mm ARC 
• Action: Semi Auto 
• Barrel Length: 18 in 
• Capacity: 26rd 
• Color/Finish: Black 
   

Detailed Features 

• 18-inch black nitride medium taper threaded barrel 
• Black hardcoat anodize aluminum receiver with Picatinny rail 
• 15-inch M-LOK handguard 
• Magpul CTR stock and Magpul MOE K2 grip 
• 26-round magazine included

Owners of the DB15 Obsidian appreciate the 6mm ARC chambering for its ballistic performance over standard 5.56 in a familiar AR-pattern platform. The black nitride barrel finish draws positive comments for corrosion resistance and durability under regular use.

The Magpul CTR stock and MOE K2 grip combination is well-regarded for out-of-the-box ergonomics. The 18-inch barrel is a point of discussion; some prefer the velocity gains with 6mm ARC, while others would prefer a shorter option for handling at the range.

Diamondback's Obsidian Series is viewed as a solid mid-tier entry in the 6mm ARC market at a competitive price. The trigger is a common upgrade candidate, though the platform accepts standard AR drop-in triggers without any modification.