The CMMG Dissent MK4 .338 ARC 10.5″ 10+1 Black Cerakote is a compact, large-bore AR pistol that brings serious stopping power to a truly portable package. By housing the recoil system inside the upper receiver, CMMG eliminated the buffer tube—making this one of the shortest and most maneuverable AR-style pistols on the market. Chambered in .338 ARC, it delivers heavy-hitting performance in a 10.5-inch barrel, perfect for home defense, truck guns, or anyone wanting big-bore capability without the bulk.
| Manufacturer | CMMG |
|---|---|
| Model | Dissent MK4 |
| Material | 7075-T6 aluminum upper/lower, steel barrel |
| Compatibility | .338 ARC ammunition, standard AR15 lower parts |
| Finish | Black Cerakote |
| Weight | Approx. 5.8 lbs (per manufacturer specs) |
| Condition | New |
Key Features
- Patent-Pending Compact Action – Why it matters: The recoil system sits in the upper receiver, so there’s no buffer tube sticking out the back. This makes the pistol shorter and easier to maneuver in tight spaces, like a vehicle or home hallway.
- .338 ARC Chambering – Why it matters: This cartridge delivers heavy-for-caliber bullet options (up to 300 grains) with significantly more energy than 5.56 or 300 Blackout, making it ideal for defensive use or hunting medium game at close range.
- 10.5″ Threaded Barrel – Why it matters: The barrel is threaded 5/8×24, letting you easily add a suppressor or muzzle brake. A 10.5-inch length balances portability with velocity retention for the .338 ARC.
- 9.60″ M-LOK Handguard – Why it matters: Plenty of rail space for lights, lasers, or grips, while keeping the overall package compact. The slim profile fits smaller hands well.
- Black Cerakote Finish – Why it matters: Cerakote provides superior corrosion resistance and a low-glare surface that holds up to hard use, rain, and sweat without rusting.
Who It’s For
New shooters who want a do-it-all AR pistol without the complexity of a traditional buffer system. Families looking for a short, reliable defensive firearm that’s easy to store and quick to deploy. Experienced shooters wanting to try the .338 ARC cartridge in a modern, modular platform.
Pros & Cons
- Pro: Short overall length (no buffer tube) makes it incredibly easy to handle and store.
- Pro: .338 ARC offers excellent terminal ballistics out of a 10.5″ barrel.
- Pro: CMMG build quality and Cerakote finish ensure longevity.
- Con: Ammo availability for .338 ARC is still limited compared to 5.56 or 300 Blackout—plan ahead and stock up.
Comparison
| Feature | CMMG Dissent MK4 .338 ARC | Geissele Super Duty 11.5″ 5.56 | Zev Technologies OZ9C 9mm |
|---|---|---|---|
| Caliber | .338 ARC | 5.56 NATO | 9mm |
| Barrel Length | 10.5″ | 11.5″ | 4.5″ |
| Recoil System | Compact Action (no buffer tube) | Standard buffer tube | Pistol slide |
| Weight | 5.8 lbs | 6.2 lbs | 2.1 lbs |
| Overall Length | ~24″ (brace collapsed) | ~32″ (stock extended) | ~7.5″ |
| Price | $1,668.69 | ~$1,800 | ~$1,400 |
The CMMG Dissent MK4 is the only one here with a recoil system in the upper receiver, making it significantly shorter than the Geissele. The Zev OZ9C is smaller but limited to 9mm ballistics. For big-bore performance in a compact package, the Dissent wins.
FAQ
What is the overall length of the CMMG Dissent MK4 .338 ARC?
Per CMMG specs, the overall length with the brace collapsed is approximately 24 inches. Without a brace or stock, it is about 20 inches. The exact length depends on your muzzle device.
Can I use standard AR-15 magazines with this pistol?
Yes, the CMMG Dissent MK4 accepts standard AR-15/M16 magazines. The .338 ARC cartridge feeds reliably from standard 5.56 magazines, though you may want to try a few brands to find what works best with your ammo.
Is the barrel threaded for a suppressor?
Yes, the 10.5-inch barrel is threaded 5/8×24, which is the common thread pitch for .30-caliber suppressors. You can attach most rifle cans directly or use a muzzle brake.
What is the recoil like compared to 5.56 or 300 Blackout?
.338 ARC produces more felt recoil than 5.56 or 300 Blackout, especially with heavier bullets (200-300 grains). It’s similar to a .308 in a similar-length barrel, but manageable with proper stance and grip.
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Last updated: April 2026
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