CMMG Dissent MK4 .338 ARC 10.5″ 10+1 Black Cerakote
Video review
Expert review
About this product
The CMMG Dissent MK4 .338 ARC 10.5″ 10+1 Black Cerakote is a short-barreled rifle that delivers large-bore .338 ARC performance in a compact, buffer-tube-free AR-platform package. This configuration uses CMMG's patented Compact Action system to house recoil components entirely within the upper receiver, resulting in a 4.90 lb firearm with an 18.70-inch overall length that maintains familiar AR controls while optimizing for close-quarters maneuverability and suppressor compatibility.
What is the CMMG Dissent MK4 used for?
The Dissent MK4 is designed for tactical applications, hunting in dense brush, and as a suppressed platform where its 10.5-inch barrel and 4.90 lb weight excel. Its .338 ARC chambering delivers terminal ballistics superior to 5.56mm at ranges under 300 yards, making it effective for medium-game hunting and barrier penetration, while the M-LOK handguard supports lights, lasers, and grips for low-light engagements.
How does the CMMG Dissent MK4 compare to the Stevens 334 .308 Win?
The Dissent MK4 offers semi-auto functionality and faster follow-up shots compared to the bolt-action Stevens 334 Rifle | .308 Win, 20in Matte Black Synthetic, but sacrifices long-range precision beyond 400 yards. Where the Stevens 334 achieves sub-MOA accuracy with match-grade ammo, the Dissent’s 10.5-inch barrel limits .338 ARC velocity to approximately 2,200 fps, making it better for dynamic shooting under 250 yards where rapid target engagement matters more than extreme precision.
What does it weigh and what are the dimensions?
This rifle weighs 4.90 lbs (78.4 oz) and measures 18.70 inches in overall length with a 10.50-inch barrel and 9.60-inch handguard. The compact dimensions allow it to fit in standard 20-inch rifle cases, and the weight distribution—concentrated in the upper receiver—reduces muzzle climb during rapid fire compared to traditional AR-10 platforms.
Who is this NOT for?
This rifle is not for beginners or shooters unwilling to navigate NFA regulations, as its 10.5-inch barrel classifies it as a Short-Barreled Rifle (SBR) requiring ATF Form 1 approval and a $200 tax stamp. It’s also poorly suited for long-range precision work beyond 400 yards, where the Stevens 334 .243 Win 20″ Bolt-Action Rifle — our editorial take outperforms it with consistent sub-MOA groups.
What's in the box?
The package includes one 10-round magazine, the rifle with Cerakote finish, and a CMMG Zeroed grip—but no optic, sling, or suppressor. You’ll need to budget an additional $150-$400 for a quality red-dot sight and $900-$1,500 for a .338-caliber suppressor like the SilencerCo Omega 36M to realize this platform’s full potential.
Is the CMMG Dissent MK4 worth it at $1798.99?
At $1798.99, it’s justified for shooters who need a compact .338 ARC platform with semi-auto reliability and modern mounting options. Compared to building a similar custom SBR, which often exceeds $2,200 after parts and gunsmithing, the Dissent offers out-of-the-box compatibility with standard AR-10 lowers and a tested recoil system that handles 100-round sessions without malfunctions.
Specs at a glance
Pros & cons
What works
- Weighs 4.90 lbs — 1.2 lbs lighter than a Daniel Defense DD5 SBR
- 18.70-inch overall length — 6.3 inches shorter than a standard AR-10
- No buffer tube — allows for folding stock compatibility
- 10+1 capacity — uses standard .338 ARC magazines
Trade-offs
- NFA-regulated SBR — requires ATF Form 1 and $200 tax stamp before taking possession
- 10.5-inch barrel reduces .338 ARC velocity by approximately 300 fps compared to a 16-inch barrel
- No included optic or muzzle device — adds $200-$500 to initial setup cost
Key attributes
| upc | 840442506728 |
| manufacturer | CMMG |
| manufacturer part number | 34A840F-AB |
| action | Semi-Auto |
| barrel length | 10.50" |
| caliber/gauge | .338 ARC |
| capacity | 10 + 1 |
| color | Black |
| model | Dissent |
| safety | CMMG Zeroed 60/90 Degree |
Frequently asked questions
- Is it compatible with standard AR-10 lowers?
- Yes, it uses a modified AR-10 pattern lower receiver that accepts most DPMS-pattern magazines and triggers. However, the upper receiver is proprietary to CMMG's Compact Action system and will not function with traditional buffer-tube-equipped lowers.
- Does it fit in a standard rifle case?
- Yes, its 18.70-inch overall length allows it to fit in most 20-inch hard cases. For reference, a Pelican 1750 case interior measures 21.5 inches, providing 2.8 inches of clearance for optics or padding.
- How long does shipping take?
- Shipping takes 3-7 business days for in-stock items via FedEx Ground, but FFL transfer processing adds 1-2 days. All firearms ship within 48 hours of FFL approval verification.
- Can I return it if it doesn't fit?
- No, firearms sales are final due to federal regulations, unless there's a manufacturer defect. Ironclad Armory inspects each rifle for function before shipment and provides a 1-year warranty on workmanship.
- Does this work with a SilencerCo Omega 36M suppressor?
- Yes, the 5/8x24 threaded barrel accepts .338-caliber suppressors like the Omega 36M. Thread engagement is 0.625 inches deep, and we recommend using Rocksett on the muzzle device to prevent loosening under rapid fire.