Diamondback DBX 5.7x28mm
Model: DB1629L001
Diamondback DBX 5.7x28mm
Model: DB1629L001
Full Specifications
About This Firearm
The Diamondback DBX is a braced, AR-pattern 5.7x28mm pistol built for range work and home defense. It has an MSRP of $1,216, and it runs standard AR-15 fire controls, so the trigger, the safety selector and the magazine release are all where a rifle shooter already reaches for them.
Upper and lower are both 7075-T6 aluminum, with a Picatinny rail along the top and an M-LOK handguard underneath. No sights are fitted, so an optic has to be bought before it can be aimed. The barrel is 8 inches of stainless with a 1:9 twist, and it feeds from 20-round FN Five-seveN magazines that drop out of the bottom of the lower. At 57.6 oz and 16.9 inches with the brace folded, it is 1.75 inches across.
If you're cross-shopping, the Kel-Tec P50 is no longer made and is a used buy. It stacks 50 rounds above a 9.6-inch barrel in a bullpup shell, so it holds more and shoots longer between reloads, but it wants FN P90 magazines that are harder to find than Five-seveN ones. The FN Five-seveN MK3 MRD has an MSRP of $1,509 and takes the same magazines in a pistol that can be holstered, with a 4.8-inch barrel instead of this one's rifle-length gas system.
Best For
Strengths & Limitations
- Diamondback uses a locked breech with a short-stroke dual piston, so the action is closer to an AR's gas system than to the blowback used in 5.7 pistols.
- Anyone who already owns a Five-seveN shares magazines between the two guns.
- A Magpul MOE K grip and an M-LOK handguard are both standard parts, so grip and furniture changes cost catalog money.
- Nothing is fitted for aiming, so an optic is a purchase on top of the price.
- The brace keeps the gun under the length that would make it a short-barreled rifle, so swapping it for a stock is a registration matter.
- The magazine supplied with it is a ProMag, and FN's own magazines are worth buying for it.
Category Rankings
How the Diamondback DBX 5.7x28mm ranks among full-size 5.7x28mm handguns.
Ballistics Calculator
Calculate trajectory, drop, and energy for 5.7x28mm ammunition.
5.7x28mm Ballistics →Where to Buy
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Alternatives to Consider
Similar full-size 5.7x28mm handguns ranked by similarity.
| NAME | BEST PRICE |
|---|---|
|
Kel-Tec P50 5.7x28mm
Kel-Tec
|
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|
Smith & Wesson M&P 5.7 5.7x28mm
Smith & Wesson
|
— |
|
Tisas PX-5.7 FO 5.7x28mm
Tisas
|
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|
FN Five-seveN MK3 MRD 5.7x28mm
FN America
|
— |
|
PSA Rock 5.7 5.7x28mm
Palmetto State Armory
|
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Frequently Asked Questions
Do FN factory magazines fit it?
Yes. Diamondback lists it with a ProMag that is Five-seveN compatible, and FN's own magazines fit the same well.
What optics can be mounted?
Anything with a Picatinny mount. There is no direct-mount optic cut in the receiver, so a red dot sits on a rail and rings or a mount are part of the budget.
Where is it made?
Diamondback builds its guns in Cocoa, Florida.
