The Diamondback DB9R is a 9mm pistol-caliber carbine built on the AR-15 platform. Upper and lower receivers are 7075-T6 aluminum. The 16-inch free-floating barrel runs on a blowback operating system. A 15-inch M-LOK handguard accepts lights, lasers, and foregrips; the full-length Picatinny rail accommodates optics. Compatible with Glock-style magazines. Features an adjustable stock and ergonomic grip.