Description
Engineered for those who demand reliability in compact defensive platforms, the Diamondback DB9R transforms the AR-15 concept into a potent 9mm pistol configuration. This American-made firearm combines the familiar ergonomics of the AR platform with the ballistic efficiency of 9mm, creating an ideal balance for close-quarters defense and tactical applications.
The DB9R features a direct gas impingement system proven in military applications, ensuring consistent cycling with various ammunition types. Its 10-inch chrome moly barrel provides optimal velocity while maintaining a manageable profile, and the 1:10 twist rate stabilizes both standard and specialized 9mm loads. The SBA3 adjustable brace offers multiple positions for secure shoulder contact, enhancing stability during rapid engagements.
- Manufacturer: Diamondback Firearms
- Model: DB9R
- Caliber: 9mm
- Barrel Length: 10″
- Twist Rate: 1:10
- Overall Length: 31.5″
- Finish: Black Nitride
- Grips: Black Magpul MOE
- Magazine Capacity: 32-Rounds
- Additional Features: SBA3 Brace
This pistol arrives ready for immediate customization with its M-LOK compatible handguard, Magpul MOE grip, and optics-ready upper receiver. The A2 flash hider mitigates muzzle signature while the Glock magazine compatibility ensures access to abundant, reliable feeding options. Whether navigating urban environments in Scottsdale or preparing for desert excursions, the DB9R provides the versatility serious operators require.
Tucson Arms ships this firearm to your selected Arizona FFL dealer for convenient transfer, ensuring compliance with all state regulations while delivering your tactical tool directly to your local specialist.





Samantha K. (verified owner) –
The fit and finish on this AR pistol is excellent. I’ve taken it to the range three times now and it’s been reliable with brass-cased ammo. Did have one failure to feed with some steel case 9mm, but that’s probably more about the ammo than the gun. The weight distribution feels balanced in hand.
Vanessa T. –
Put about 300 rounds through it at the range in Phoenix. The accuracy was impressive for a pistol-length barrel – I was keeping groups under 3 inches at 25 yards. My only complaint is the trigger pull feels heavier than I expected. Still a solid purchase overall.
Ryan S. (verified owner) –
The compact size makes it perfect for maneuvering around the house. I tested it with several different 9mm hollow point brands and it cycled everything without issue. The brace system is comfortable and provides good stability. After putting 500 rounds through it, I have zero malfunctions to report.
Diego M. (verified owner) –
Took this out to the desert near Tucson last weekend and it performed flawlessly. The 9mm caliber made it easy to shoot all afternoon without breaking the bank on ammo. The SBA3 brace felt solid against my shoulder, and I was hitting steel consistently at 50 yards. Definitely my new favorite AR pistol.