The Diamondback DBX57 5.7x28mm semi-auto tactical pistol pairs an unconventional caliber with AR-platform ergonomics in a compact 8-inch package. Built on an aluminum frame with M-LOK rail system, the DBX57 appeals to shooters exploring the versatility of 5.7x28mm—a cartridge prized for its velocity, capacity, and shootability in both range and defensive contexts. This isn't a traditional handgun; it's a pistol-caliber carbine platform that bridges the gap between a rifle and a PDW, offering shooters a modern alternative in an increasingly practical round.
The DBX57 uses a locked-breech dual gas piston operating system for reliable cycling across the round's performance envelope. Its 7075-T6 aluminum frame receives hard-coat anodizing for durability, while the 6061-T6 handguard (also hard-anodized) incorporates M-LOK slots for mounting accessories. The 8-inch barrel is rifled at 1:9 twist rate and threaded 1/2x28 RH, accepting standard muzzle devices—a DBX muzzle device ships with the gun. Trigger control comes from a standard AR15 mil-spec trigger, familiar to anyone who's worked an AR rifle. The MagPul MOE K grip rounds out the ergonomic package. Overall dimensions run 15.25 inches long, 7.3 inches tall, and 1.75 inches wide, with an unloaded weight of 3.0 pounds—light enough for extended handling yet substantial enough to manage recoil and muzzle impulse.
Magazine capacity is 20 rounds using FN Five-SeveN–compatible magazines, giving you commonality with civilian 5.7x28mm pistol platforms if you already own them. No iron sights are included, so plan for an optic—the top rail accommodates red dots, magnified scopes, or hybrid systems depending on your intended use. Whether you're curious about 5.7x28mm ballistics, want a suppressor-ready rimfire alternative, or need a compact platform for specialized training, the DBX57 opens the door to an underrated category.
| Caliber | 5.7x28mm |
| Action | Semi-Auto, Locked Breech Dual Gas Piston |
| Barrel Length | 8 inches |
| Barrel Twist Rate | 1:9 RH |
| Muzzle Thread | 1/2x28 RH |
| Frame Material | 7075 Aluminum Hard-Coat Anodized |
| Handguard Material | 6061 Aluminum Hard-Coat Anodized, M-LOK Compatible |
| Trigger | Standard AR15 Mil-Spec |
| Grip | MagPul MOE K |
| Magazine Capacity | 20 Rounds (FN Five-SeveN Compatible) |
| Sights | None Included |
| Overall Length | 15.25 inches |
| Overall Height | 7.3 inches |
| Overall Width | 1.75 inches |
| Weight (Empty Magazine) | 3.0 pounds |
| Finish | Gray |
| Model | DB1614L051 |
The DBX57 ships without iron sights or an optic. You'll need to source your own sight system—the top rail is ready for a red dot, magnified scope, or hybrid setup depending on your intended range or use case.
Yes. The 8-inch barrel is threaded 1/2x28 RH and includes a DBX muzzle device, making it ready for standard suppressors or other muzzle attachments in that thread pitch.
The DBX57 accepts FN Five-SeveN–compatible magazines. It comes with one 20-round magazine.
Yes. The 6061 aluminum handguard features M-LOK slots, so you can attach lights, laser modules, rail sections, or other M-LOK-compatible gear to customize your setup.
Firearm Shipments:
To buy rifles or shotguns, you must be 18 years old, and for handguns, actions, or receivers, the minimum age is 21. By placing an order for this firearm, you confirm that you are the legitimate transferee/buyer, meet the legal age requirements, and comply with all Federal, State, and local laws and regulations necessary to purchase this firearm.
We only ship firearms to valid Federal Firearms License (FFL) holders. At checkout we provide a FFL locator for your convenience.
We will need a copy of the FFL’s license to facilitate the process, kindly request your dealer to email us a copy of their FFL, as we cannot dispatch the firearm until we receive this document. It is imperative for the buyer to choose their FFL dealer, ensure they are willing to facilitate the transfer, and have them email their FFL copy to BOSQUE Outdoors. To avoid any confusion, the customer's name or order number must be mentioned in the email containing the FFL.
Email: [email protected]
Diamondback
Zenith Firearms
Zenith Firearms
Zenith Firearms
