Caliber: 9×19mm (9mm Luger).

Barrel options: Common factory model has a 16″ 4150 CrMoV barrel (black nitride finish) in the carbine variant; shorter pistol-length options (e.g., ~4.5″) are also offered.

Action / operating: Typically a blowback-style 9mm PCC design (DB9R documentation describes blowback/gas system details per model).

Twist rate: Commonly 1:10″ for stabilizing typical 9mm bullets.

Handguard / furniture: 15″ M-LOK handguard on many models; Magpul stock and grip on several packages.

Muzzle device: A2 flash hider is used on some factory builds.

Magazine capacity: Retail listings commonly show a 32-round factory magazine included for the 16″ carbine model (configurations vary by model and local laws). It will also work with common 9mm magazines depending on the lower and magwell setup.

Finish options: Black hardcoat anodize, FDE Cerakote, and Midnight Bronze / Cerakote finishes are listed on Diamondback’s DB9R pages and dealer listings.