The Diamondback DBX57 5.7x28 is a modern, compact semi-auto rifle built for shooters who want a lightweight, maneuverable platform in a specialized intermediate cartridge. Chambered in 5.7x28mm with an 8-inch barrel, this short-barreled rifle (SBR) uses a locked-breech dual gas piston operating system for reliable function and low recoil. At just 3.7 pounds with magazine and brace, it's one of the most portable rifle options available—ideal for home defense, range work, or anyone curious about the ballistics and controllability of the 5.7x28 round.

The DBX57 is built on a 7075 aluminum hard-coat anodized receiver paired with a 6061 aluminum handguard, keeping weight down while maintaining durability. The M-LOK-compatible handguard gives you plenty of room for lights, lasers, or other tactical accessories. A side-folding brace mounted to the rear Picatinny rail collapses the overall length to just 16.9 inches (extended to 25.4 inches), making this rifle genuinely compact without sacrificing ergonomics. The barrel is threaded 1/2x28 RH and ships with a Diamondback muzzle device.

Controls are straightforward: a mil-spec AR-trigger, Magpul MOE K grip, and Magpul handstop kit keep your hands comfortable and your grip consistent. The rifle ships with one 20-round magazine compatible with FN Five-SeveN magazines, and the 1:9 right-hand twist barrel is optimized for 5.7x28 ammunition. No iron sights are included, so plan to add optics or backup sights to suit your mission. Whether you're building a specialized AR pistol alternative or exploring the growing 5.7x28 ecosystem, the DBX57 delivers compact, lightweight performance.

The Diamondback DBX57 5.7x28 is a modern, compact semi-auto rifle built for shooters who want a lightweight, maneuverable platform in a specialized intermediate cartridge. Chambered in 5.7x28mm with an 8-inch barrel, this short-barreled rifle (SBR) uses a locked-breech dual gas piston operating system for reliable function and low recoil. At just 3.7 pounds with magazine and brace, it's one of the most portable rifle options available—ideal for home defense, range work, or anyone curious about the ballistics and controllability of the 5.7x28 round.

The DBX57 is built on a 7075 aluminum hard-coat anodized receiver paired with a 6061 aluminum handguard, keeping weight down while maintaining durability. The M-LOK-compatible handguard gives you plenty of room for lights, lasers, or other tactical accessories. A side-folding brace mounted to the rear Picatinny rail collapses the overall length to just 16.9 inches (extended to 25.4 inches), making this rifle genuinely compact without sacrificing ergonomics. The barrel is threaded 1/2x28 RH and ships with a Diamondback muzzle device.

Controls are straightforward: a mil-spec AR-trigger, Magpul MOE K grip, and Magpul handstop kit keep your hands comfortable and your grip consistent. The rifle ships with one 20-round magazine compatible with FN Five-SeveN magazines, and the 1:9 right-hand twist barrel is optimized for 5.7x28 ammunition. No iron sights are included, so plan to add optics or backup sights to suit your mission. Whether you're building a specialized AR pistol alternative or exploring the growing 5.7x28 ecosystem, the DBX57 delivers compact, lightweight performance.