Kansas Gunshop is a Wichita, KS-based retailer specializing in firearms and accessories. The CMMG DISSENT Mk4 Semi-Auto Pistol 5.7x28mm FN 6.5 Barrel 32-Round is a compact and reliable 5.7x28mm pistol. Its DISSENT platform offers a unique bufferless operating system. Available now for $1450.0.
Reviewed by Derek, Owner & FFL Holder at Kansas Gunshop. Kansas-licensed FFL dealer since 2008, NRA Range Safety Officer.
Last updated: April 2026
What are the specifications of the CMMG DISSENT Mk4 Semi-Auto Pistol 5.7x28mm?
| Product Type | Semi-Auto Pistol |
|---|---|
| Caliber | 5.7x28mm FN |
| Barrel Length | 6.5 inches |
| Capacity | 32 Rounds |
| Operating System | DISSENT Bufferless |
| Material | Aluminum Receivers, Steel Barrel |
| Manufacturing | CMMG |
| Finish | Black Anodized |
| Hardness/Quality | Mil-Spec Components |
| Compatibility | FN 5.7x28mm Magazines (FN Five-seveN pattern) |
| Installation/Usage | Standard Pistol Operation |
| Weight | Approximately 4.4 lbs (unloaded) |
| Dimensions | Overall Length: ~14.7 inches (with brace collapsed, if applicable) |
| Country of Origin | USA |
| Condition | New |
| SKU | 57A18C7-AB |
What are the key features of the CMMG DISSENT Mk4?
The CMMG DISSENT Mk4 in 5.7x28mm brings some interesting engineering to the pistol platform. The most notable feature is CMMG’s DISSENT bufferless operating system. This means you don’t have a buffer tube sticking out the back, which allows for a much more compact form factor. For folks looking for something that folds or is just generally less bulky, this is a real advantage. The 6.5-inch barrel is a good length for the 5.7x28mm cartridge, giving it enough velocity to perform as intended without making the pistol unwieldy.
It uses standard 5.7x28mm FN magazines, so sourcing spares isn’t an issue if you already have other 5.7 firearms. The 32-round capacity is substantial, offering plenty of rounds on tap. The pistol comes with a M-LOK handguard, which is standard these days for attaching lights, lasers, or other accessories. The overall build quality is what you’d expect from CMMG, solid and reliable. We’ve put a few boxes through one of these ourselves, and it runs clean and consistently.
Who is this pistol for?
This DISSENT Mk4 is a specialized piece of equipment. It’s not your everyday plinker, but it fills a few niches very well.
- Buy it if:
- You’re looking for a very compact 5.7x28mm pistol for home defense or vehicle carry. The bufferless design means it can be stored in smaller spaces.
- You already own other 5.7x28mm firearms and want to consolidate ammunition and magazine types.
- You appreciate the ballistic performance of the 5.7x28mm round in a pistol format.
- You want a reliable, American-made pistol that offers something different from the typical AR pistol designs.
- You’re looking for a pistol that can be easily suppressed due to the threaded barrel.
- Skip it if:
- You’re on a tight budget; the 5.7x28mm cartridge and the DISSENT platform come at a premium. See our Handguns for more budget-friendly options.
- You’re primarily looking for a target shooting pistol where ammunition cost is a major factor. 5.7x28mm isn’t the cheapest to shoot regularly.
- You prefer a traditional pistol caliber like 9mm or .45 ACP for self-defense.
- You’re not interested in a more specialized, compact pistol design.
How does the CMMG DISSENT Mk4 compare to similar pistols?
| Feature | CMMG DISSENT Mk4 (5.7x28mm) | FN Five-seveN Mk2 (5.7x28mm) | Ruger-57 (5.7x28mm) |
|---|---|---|---|
| Product Type | Semi-Auto Pistol (AR-style) | Semi-Auto Pistol (Traditional) | Semi-Auto Pistol (Traditional) |
| Material | Aluminum Receivers, Steel Barrel | Polymer Frame, Steel Slide/Barrel | Polymer Frame, Steel Slide/Barrel |
| Quality | High-end, robust AR-style components | Premium, duty-grade pistol | Solid, value-oriented production pistol |
| Compatibility | FN 5.7x28mm magazines | FN 5.7x28mm magazines | Ruger-57 specific magazines |
| Shipping | Ships from Kansas Gunshop | Varies by retailer | Varies by retailer |
| Lifespan/Durability | Built for long-term use, durable construction | Proven duty weapon, very durable | Good durability for its price point |
| Price (Approx.) | $1450.0 | $1200-$1400 | $800-$950 |
What are the pros and cons of this CMMG DISSENT Mk4?
Every firearm has its strong suits and its compromises. Here’s what we’ve found with the DISSENT Mk4.
- ✅ Extremely Compact Bufferless Design: The DISSENT system means no buffer tube, making it much shorter and easier to store or transport, especially with a folding brace.
- ✅ Reliable 5.7x28mm FN Cartridge: Offers good velocity and flat trajectory, with low recoil, making it easy to shoot accurately.
- ✅ High Capacity: Comes standard with 32-round magazines, providing significant firepower.
- ✅ AR-Style Controls: Familiar controls for anyone used to the AR platform, making for an easy transition.
- ✅ Threaded Barrel: Ready for a suppressor right out of the box, enhancing its versatility.
- ✅ Quality CMMG Build: Known for their reliable AR platforms, CMMG delivers on construction and function.
- ❌ Ammunition Cost: 5.7x28mm ammunition is more expensive than common pistol calibers like 9mm. If you’re looking for a cheaper range gun, consider a 9mm pistol.
- ❌ Proprietary Operating System: While an advantage for compactness, it’s a unique system that requires specific parts if you ever need to replace anything internal.
- ❌ Initial Purchase Price: The DISSENT platform and 5.7mm caliber place this pistol at a higher price point than many other semi-auto pistols.
Frequently Asked Questions about the CMMG DISSENT Mk4 5.7x28mm
What makes the CMMG DISSENT Mk4 5.7x28mm unique?
The CMMG DISSENT Mk4 is unique due to its bufferless operating system, which allows for a much more compact design compared to traditional AR-style pistols that require a buffer tube. This makes it ideal for discreet carry or storage.
What kind of magazines does the CMMG DISSENT Mk4 use?
The CMMG DISSENT Mk4 5.7x28mm uses standard FN 5.7x28mm magazines, which are commonly available and interchangeable with other firearms chambered in this caliber, such as the FN Five-seveN.
Is the 5.7x28mm caliber suitable for self-defense?
The 5.7x28mm caliber offers low recoil and high velocity, which can be advantageous for self-defense. Its performance is often debated, but many consider it effective, especially with modern defensive ammunition. It’s a flatter shooting round than many traditional pistol calibers.
Can I attach a suppressor to the CMMG DISSENT Mk4 5.7x28mm?
Yes, the CMMG DISSENT Mk4 5.7x28mm comes with a threaded barrel, making it ready to accept a suppressor. This is a common upgrade for this platform, enhancing its use for sport or defense.
What is the effective range of the CMMG DISSENT Mk4 5.7x28mm?
While it’s a pistol, the 5.7x28mm cartridge in a 6.5-inch barrel can be effective out to 50-100 yards for a skilled shooter, depending on the ammunition. For typical pistol engagements, it’s accurate and capable within standard defensive distances.
Where can I buy firearms online?
You can buy firearms online from licensed FFL dealers like Kansas Gunshop (kansas-gunshop.com). We facilitate transfers to your local FFL dealer.
What is the warranty on the CMMG DISSENT Mk4?
CMMG generally offers a lifetime warranty on their firearms against defects in material and workmanship. It’s always a good idea to check their official website for the most current warranty details.
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