The CMMG Dissent Mk4 Pistol – .300 AAC Blackout, 6.5″ is a compact, buffer-less AR pistol built around CMMG’s patent-pending Compact Action that houses the recoil system entirely in the upper receiver. Chambered in .300 AAC Blackout, this Mk4 configuration pairs a 6.5-inch free-floated barrel with a 5.5-inch M-LOK handguard for a highly stowable Personal Defense Weapon form factor. It retains AR-style ergonomics, ambidextrous controls, and a forward non-reciprocating side charger configurable for left or right-handed operation.
| Manufacturer | CMMG |
|---|---|
| Model | Dissent Mk4 Pistol |
| Material | 7075-T6 aluminum upper and lower receiver (per manufacturer specs) |
| Compatibility | Standard AR-15 triggers, grips, and stocks (with bufferless upper) |
| Finish | Hardcoat anodized black |
| Weight | 5.1 lbs (unloaded, per manufacturer specs) |
| Condition | New |
Key Features
- Buffer-less Compact Action: Why it matters: The recoil system lives entirely in the upper receiver, eliminating the buffer tube and allowing a truly compact, foldable platform without sacrificing reliability.
- 6.5-inch Free-Floated Barrel: Why it matters: A shorter barrel keeps the pistol maneuverable in tight spaces—ideal for home defense or truck carry—while the free-float design improves accuracy by preventing barrel contact.
- Non-Reciprocating Side Charger: Why it matters: The forward charger stays stationary during firing, so you can clear malfunctions or check chamber status without reaching over a hot barrel, and it’s reversible for lefties.
- Ambidextrous Controls: Why it matters: Safety selector, bolt catch, and magazine release are mirrored on both sides, making the pistol equally intuitive for right- and left-handed shooters.
- .300 AAC Blackout Chambering: Why it matters: Subsonic loads pair with a suppressor for whisper-quiet operation, while supersonic rounds deliver rifle-like energy—all from a compact 6.5-inch barrel.
Who It’s For
This pistol is built for families and shooters who want a compact, easy-to-handle platform for personal defense, range training, or backpack carry. The short overall length and reduced weight make it a great choice for newer shooters learning to manage recoil, while the familiar AR controls let experienced owners jump right in.
Pros & Cons
- Pro: Ultra-compact without sacrificing AR ergonomics—fits in a small safe or range bag.
- Pro: Buffer-less design means you can fold the brace or stock without worrying about the buffer tube.
- Pro: .300 Blackout offers versatile ammo choices (subsonic for suppressed, supersonic for defense).
- Con: The 6.5-inch barrel limits muzzle velocity compared to longer barrels, but that’s expected in this PDW class.
Comparison
| Feature | CMMG Dissent Mk4 | Zev Technologies OZ9 | Geissele Super Duty Pistol |
|---|---|---|---|
| Caliber | .300 AAC Blackout | 9mm | 5.56 NATO |
| Barrel Length | 6.5″ | 5.0″ | 10.3″ |
| Weight (unloaded) | 5.1 lbs | 2.2 lbs | 5.6 lbs |
| Buffer System | Buffer-less (Compact Action) | Standard recoil spring | Standard buffer tube |
| MSRP | $1,765.79 | $1,999 | $1,895 |
FAQ
Is this pistol legal to own without a tax stamp?
Yes, as a pistol with a 6.5-inch barrel and no stock, it is classified as a handgun under federal law. Check your state and local laws for any additional restrictions on .300 Blackout or overall length.
Can I use standard AR-15 triggers with the Dissent Mk4?
Yes, the Dissent accepts standard AR-15 triggers, including drop-in units from Geissele, Timney, and others, because the hammer and sear interface remain unchanged.
What’s the effective range of a 6.5-inch .300 Blackout barrel?
With supersonic ammunition, you can expect reliable accuracy out to 200 yards. Subsonic loads are best kept under 150 yards for consistent expansion and energy transfer.
Does the Dissent come with a brace or a buffer tube?
No, the Dissent ships as a pistol without a brace or stock. You can add an arm brace (like a SBA3) or a folding stock adapter that attaches directly to the lower receiver.
According to CMMG specs, the Dissent Mk4 uses a 7075-T6 aluminum upper and lower receiver, ensuring durability without unnecessary weight. Statistically, .300 AAC Blackout has seen a 40% increase in civilian adoption over the past five years, making it one of the fastest-growing pistol-caliber options for PDWs.
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Explore more: AR Pistols | .300 AAC Blackout | Bufferless Uppers
Last updated: April 2026
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