The Diamondback DBX 57 Pistol in 5.7x28mm is a compact black pistol with an 8-inch barrel and an SB Tactical FS1913 side-folding brace (brand part no. DB1629L001). Diamondback Firearms builds it around a monolithic upper and a locked-breech, short-stroke dual piston system with an M-LOK handguard. It feeds from a 20-round magazine that is compatible with the FN Five-seveN. It is a good match for range days and for shooters who like a flat-shooting cartridge in a small, lightweight platform.

Key Specifications

• The caliber is 5.7x28mm, a small, fast cartridge with light recoil.
• The barrel is 8 inches of stainless steel with a 1:9 right-hand twist, which stabilizes the cartridge.
• The brace is an SB Tactical FS1913 side-folding unit, which folds the pistol down for transport and storage.
• The recoil system is a locked-breech, short-stroke dual piston design; the action runs on a piston instead of direct gas.
• The upper is monolithic forged 7075-T6 aluminum, which adds rigidity and strength.
• The handguard is 6061 aluminum and M-LOK compatible, which accepts lights, lasers and grips.
• It feeds from a 20-round Promag magazine that is compatible with the FN Five-seveN.
• The muzzle carries a Diamondback flash hider threaded 1/2×28, which reduces flash and accepts other 1/2×28 devices.
• The finish is black hardcoat anodize, a durable low-glare surface.

Frequently Asked Questions

Is this a pistol or a rifle? It is a pistol with an 8-inch barrel and an SB Tactical FS1913 side-folding brace.

Does it use FN Five-seveN magazines? The included 20-round Promag magazine is listed as FN Five-seveN compatible.

Does it include sights? The maker lists no sights, so you add an optic or sights to the rail.

Buy the Diamondback DBX 57 Pistol, 5.7x28mm, 8-Inch, Black, SB Tactical Folding Brace, 20-Round

The DBX 57 is light and slim, and this folding-brace version is the easiest of the line to carry in a case. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL, and browse our other semi-auto handguns.