The Diamondback DB9R is a semi-automatic 9mm rifle with a 16-inch barrel and 32+1 capacity. The 7075-T6 aluminum receiver keeps it at 6.80 lbs., and the adjustable Magpul MOE carbine stock covers a 32.75" to 36" OAL range depending on your setup. 
 

Key Specifications 

• Model: DB9R 
• Caliber: 9mm Luger 
• Action: Semi-Auto 
• Barrel Length: 16 inches 
• Capacity: 32+1 rounds 
• Safety: Manual Thumb Safety 
• Overall Length (OAL): 32.75" - 36" 
• Weight: 6.80 lbs 
• Stock Description: Adjustable Magpul MOE Carbine Stock 
• Muzzle Device: A2 Flash Hider 
• Receiver Material: 7075-T6 Aluminum 
• Sights: Optic Ready 
   

Detailed Features 

 
The 9mm chambering keeps ammo costs reasonable for range use while the 32+1 magazine cuts down on reload breaks during extended sessions. The optic-ready top rail accepts red dots and other optics without modification, and the A2 flash hider is replaceable if you want a different muzzle device. 
 
The Magpul MOE stock adjusts for length-of-pull across five positions, which helps accommodate different body sizes or shooting positions. The 7075-T6 aluminum construction balances durability against weight. 
 
Priced below comparable 9mm carbines from other brands, the DB9R is a practical option for recreational shooting or as a home defense rifle.

The Diamondback DB9R gets a generally positive reception, though with some honest caveats.

On the plus side, owners appreciate the value proposition. The DB9R costs less than many PCC competitors while covering the basics well — semi-auto reliability, a 32+1 capacity that keeps you shooting longer, and manageable 9mm recoil that's easy for most shooters to handle. The adjustable stock is a practical feature for multi-user households or range days with friends of varying sizes.

The recurring concerns involve build quality and durability. Some owners report components that feel less solid than comparable rifles and occasional malfunctions that show up earlier than expected. Ergonomics also split opinion — some find the handling natural, others think the layout needs refinement. These issues don't show up universally but come up often enough to be worth noting.

For buyers looking at an entry-level 9mm rifle who want to keep costs down, the DB9R is a reasonable starting point. Buyers who prioritize long-term durability over price may want to look at more established PCC platforms.