The Diamondback DB15 is a semi-automatic rifle chambered in .350 Legend, built on a forged 7075-T6 aluminum receiver with a 16-inch chrome-moly steel barrel (black nitride finish, 1-in-8 twist). It weighs 6.30 lbs and adjusts from 32.50 to 35.75 inches overall with the Magpul CTR stock. Capacity is 5+1 rounds. 
 

Key Specifications 

• Model: DB15 
• Caliber: .350 Legend 
• Action: Semi-Auto 
• Barrel Length: 16 inches 
• Capacity: 5+1 rounds 
• Weight: 6.30 lbs 
• Overall Length: Adjustable from 32.50" to 35.75" 
• Finish: Black Hard Coat Anodized 
• Safety Mechanism: Manual Thumb Safety 
• Trigger Type: Mil-Spec Trigger 
• Grip Type: Standard MOE K2 Grip 
• Stock Type: Adjustable Magpul CTR Stock 
• Sights System: Optic Ready 
   

Detailed Features 

 
The Magpul CTR stock adjusts length of pull across six positions, and the M-Lok handguard accepts accessories and optic mounts. A flash hider ships from the factory. The optic-ready flat-top upper takes standard AR mounts. 
 
The chrome-moly barrel with black nitride treatment is a practical corrosion-resistant option. The 1-in-8 twist stabilizes the heavier .350 Legend projectiles well. 
 

Usage Scenarios 

 
The .350 Legend is purpose-built for deer hunting in straight-walled cartridge states that restrict bottleneck centerfire rifle cartridges. The DB15 in this caliber fits that application directly. At 6.30 lbs. and with an adjustable stock, it's comfortable in the field. The flash hider and semi-auto action also make it functional for range use, though .350 Legend ammunition is less widely available than 5.56.

The DB15 in .350 Legend gets decent marks overall, with a few consistent caveats.

Reliability and performance get positive feedback. The .350 Legend is praised specifically for deer hunting — manageable recoil, enough power for medium game, and legal compliance in straight-walled cartridge jurisdictions. Most owners report consistent cycling without issues.

Build quality reviews are mixed. Some owners describe the construction as solid and well-finished; others note cosmetic or fit-and-finish issues. This is a quality-control variable, not a universal defect.

Ergonomics are generally favorable. The adjustable stock and standard AR grip layout are familiar and functional. Some shooters mention the rifle feels slightly heavy or front-heavy during extended carry, though at 6.30 lbs. this is subjective.

Customization potential is mentioned positively. Standard AR accessories and M-Lok attachments fit without modification.

Value relative to price is a frequent talking point. Most owners feel it's competitive for the price bracket.

Ammunition availability is a real-world concern. .350 Legend isn't as widely stocked as .223/5.56, and prices per round run higher. This is a caliber limitation, not a rifle limitation, but it affects how practical the platform is for regular range use.

Customer service experiences vary noticeably. Positive and negative interactions are both reported with no strong consensus.