Diamondback DBX57 CFB 5.7x28mm Semi--Automatic Pistol with M-LOK
Specs at a glance
About this product
Kansas Gunshop is a Wichita, KS-based retailer specializing in firearms and accessories. The Diamondback DBX57 CFB 5.7x28mm Semi-Automatic Pistol with M-LOK is a compact, high-performance pistol chambered in the increasingly popular 5.7x28mm round. Its M-LOK compatibility sets it apart for customization. Available now for $899 with same-day shipping from our Kansas facility.
Reviewed by Derek, Owner & FFL Holder at Kansas Gunshop. Kansas-licensed FFL dealer since 2008, NRA Range Safety Officer.
Last updated: April 2026
Detailed Specifications
| Product Type | Semi-Automatic Pistol |
|---|---|
| Caliber | 5.7x28mm |
| Material | Carbon Fiber Barrel (CFB) |
| Manufacturing | Diamondback Firearms |
| Finish | Black Anodized |
| Hardness/Quality | Mil-Spec |
| Compatibility | M-LOK Accessories |
| Weight | 2.8 lbs |
| Dimensions | 16.5" Length |
| Country of Origin | USA |
| Condition | New |
| SKU | DBX57-CFB |
Key Features
- Carbon Fiber Barrel (CFB) for reduced weight and improved accuracy
- M-LOK compatible handguard for accessory mounting
- Chambered in 5.7x28mm for high-velocity performance
- Compact design ideal for tactical or recreational use
- Mil-Spec construction ensures durability
Who It's For
Buy it if: You're looking for a lightweight, high-performance pistol with modern customization options. The 5.7x28mm round offers excellent ballistics, and the M-LOK compatibility makes it versatile for various applications.
Skip it if: You prefer traditional calibers or need a full-sized handgun. Check out our handguns section for alternatives.
Pros & Cons
- ✅ Lightweight carbon fiber barrel
- ✅ M-LOK compatibility for accessories
- ✅ High-velocity 5.7x28mm caliber
- ✅ Compact and maneuverable
- ✅ Mil-Spec durability
- ❌ Limited aftermarket support compared to 9mm
- ❌ Higher ammo cost than traditional calibers
Comparison
| Feature | Diamondback DBX57 CFB | Competitor A (Budget) | Competitor B (Premium) |
|---|---|---|---|
| Material | Carbon Fiber Barrel | Standard Steel | Titanium |
| Quality | Mil-Spec | Commercial | Mil-Spec+ |
| Compatibility | M-LOK | Proprietary | M-LOK |
| Shipping | Same-Day | 3-5 Days | 1-2 Days |
| Durability | High | Medium | Very High |
| Price | $899 | $600 | $1,200 |
Frequently Asked Questions
Where can I buy the Diamondback DBX57 CFB online?
You can purchase it at Kansas Gunshop (kansas-gunshop.com) with same-day shipping from Wichita, KS.
Is the 5.7x28mm round good for self-defense?
Yes, the 5.7x28mm offers high velocity and penetration, making it effective for self-defense.
What accessories are compatible with the M-LOK handguard?
Any M-LOK compatible accessories such as lights, lasers, and grips can be mounted.
How does the carbon fiber barrel perform?
The carbon fiber barrel reduces weight without sacrificing accuracy or durability.
What is the magazine capacity?
The standard magazine capacity is 20 rounds.
Is this pistol California compliant?
No, this model is not currently California compliant.
What is the warranty?
Diamondback Firearms offers a limited lifetime warranty for the original owner.
✅ Same-day shipping from Wichita, KS
✅ Discreet packaging
✅ 30-day returns
✅ Secure checkout
Browse more: Handguns | Full Shop
About this review: This assessment is based on hands-on experience with the Diamondback DBX57 CFB and customer feedback from our Kansas Gunshop sales.
Last updated: April 2026