Description
The Diamondback DBX57 5.7×28 8″ Bright Nickel 30rd Brace is a semi-automatic pistol that bridges the gap between a compact carbine and a full-size handgun. Chambered in the flat-shooting 5.7x28mm, this model features an 8-inch barrel, a Strike FSA dual folding brace, and a Bright Nickel Cerakote finish over a forged 7075 T-6 aluminum receiver. It ships with one 30-round magazine, giving you 30+1 capacity right out of the box.
| Manufacturer | Diamondback Firearms |
|---|---|
| Model | DBX57 |
| Material | Forged 7075 T-6 aluminum receiver, 6061 aluminum M-LOK handguard |
| Compatibility | 5.7×28mm ammunition, accepts standard DBX57 magazines |
| Finish | Bright Nickel Cerakote |
| Weight | 5.2 lbs (with brace and empty magazine, per manufacturer specs) |
| Condition | New |
Key Features
- Dual Gas Piston System – Reduces felt recoil and keeps carbon fouling out of the receiver, which matters for reliability during extended range sessions and faster follow-up shots.
- Strike FSA Dual Folding Brace – Provides a stable shooting platform when deployed and folds compact for storage or transport, critical for shooters who need a PDW-style package without an NFA stamp.
- 8″ Barrel with 1:9 Twist – Optimized for 5.7×28mm ball and defensive loads, giving you improved velocity and accuracy over shorter pistol barrels without adding excessive length.
- Bright Nickel Cerakote Finish – Corrosion-resistant and easy to clean, ideal for shooters in humid environments or those who prefer a low-maintenance, high-visibility coating.
- 30-Round Magazine Included – High capacity means fewer reloads on the clock, a real advantage for training drills or competition stages.
Who It’s For
This pistol is built for shooters who want a lightweight, high-capacity platform that handles like a carbine but fits in a backpack. It’s a strong fit for training students transitioning from handgun to long gun, for new shooters who want low recoil with high magazine capacity, and for anyone who appreciates the 5.7×28mm’s flat trajectory and reduced weight over 9mm or .223.
Pros & Cons
- Pros: Low recoil, 30+1 capacity, folding brace for compact carry, durable Cerakote finish, dual gas piston for cleaner operation.
- Cons: 5.7×28mm ammunition is more expensive than 9mm, and aftermarket support is smaller than for AR-pattern pistols. The 8″ barrel limits some muzzle velocity compared to 10″+ barrels, though it still outperforms handgun-length barrels.
Comparison: DBX57 vs. Similar Platforms
| Feature | Diamondback DBX57 | Ruger-57 | PSA Rock 5.7 |
|---|---|---|---|
| Barrel Length | 8″ | 4.94″ | 4.8″ |
| Capacity | 30+1 | 20+1 | 23+1 |
| Weight (empty) | 5.2 lbs | 1.9 lbs | 1.6 lbs |
| Brace Included | Yes (Strike FSA dual folding) | No | No |
| MSRP | $1,167.11 | $799 | $499 |
The DBX57 offers a longer barrel and integrated brace that the Ruger-57 and PSA Rock don’t provide out of the box, but at a higher price point. If you want a braced pistol ready to shoot with minimal modification, the DBX57 saves you money on aftermarket parts.
Frequently Asked Questions
Does the DBX57 come with a brace or a stock?
It ships with the Strike FSA dual folding brace, which is classified as a pistol brace by the ATF. This allows you to shoulder it without an NFA tax stamp.
What magazines does the DBX57 use?
It uses proprietary 30-round magazines made by Diamondback. One magazine is included with the pistol.
Is the DBX57 reliable with all 5.7×28mm ammunition?
Per Diamondback specs, the dual gas piston system is designed to run with standard-pressure 5.7×28mm loads. Most shooters report good function with Federal, FN, and American Eagle ammunition. As with any gas system, break-in may require 200-300 rounds.
Can I mount an optic or light on the DBX57?
Yes. The 6061 aluminum handguard has M-LOK slots at the 3, 6, and 9 o’clock positions, and the receiver top has a Picatinny rail for optics. You can mount a red dot, magnifier, or iron sights directly.
How does the DBX57 compare to a 9mm pistol with a brace?
The 5.7×28mm round produces significantly less recoil than 9mm, has a flatter trajectory, and carries two to three more rounds in a standard magazine. The trade-off is higher ammunition cost and less common availability at local stores.
Why Buy From Us
- ✓ Nationwide delivery (all 50 states)
- ✓ Ships 1-2 business days
- ✓ 30-day returns
- ✓ Secure checkout
Last updated: April 2026
Related categories: Semi Auto Handguns, 5.7×28mm Pistols, Braced Pistols
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