The CMMG 60AA90C-MB DISSENT MK4 6MMARC 16.1 MDBRZ gives you the reach of a .243 or .308Win in a package that handles like an AR-15. No heavy AR-10 platform, no extra weight—just a flat-shooting 6mm ARC carbine built for work at distance. This rifle packs ZEROED parts and the DISSENT side-folding stock with adjustable length of pull and cheek riser, plus a forward non-reciprocating charging handle. If you need a long-range tool that doesn’t drag you down, this is it.
| Manufacturer | CMMG |
|---|---|
| Model | DISSENT MK4 |
| Material | 7075-T6 aluminum upper/lower receiver, steel barrel (per manufacturer specs) |
| Compatibility | 6mm ARC ammunition, AR-15 lower parts, CMMG ZEROED accessories |
| Finish | MDBRZ (Midnight Bronze Cerakote) |
| Weight | 7.2 lbs (as configured, per CMMG specs) |
| Condition | New |
Key Features
- 6mm ARC chambering – WHY IT MATTERS: You get .243-level ballistics with less recoil and wind drift, making hits on steel or varmints at 800 yards practical from a carbine-length gun.
- DISSENT side-folding stock with adjustable cheek riser – WHY IT MATTERS: The stock folds for compact storage in a truck or pack, and the cheek riser lets you line up with optics without a chin weld.
- Forward non-reciprocating charging handle – WHY IT MATTERS: You charge the gun without moving your firing grip, keeping the muzzle on target and clearing malfunctions faster.
- ZEROED parts integration – WHY IT MATTERS: CMMG matches barrel, bolt, and gas system from the factory, so the rifle runs reliable without you having to tune it.
- 16.1-inch barrel with 1:7.5 twist – WHY IT MATTERS: That twist stabilizes heavy 108-grain and 112-grain 6mm ARC bullets, giving you full long-range performance without a longer barrel.
Who It’s For
This rifle is for ranchers and rural workers who need to reach coyotes, hogs, or steel targets past 400 yards without humping an AR-10 all day. It’s for the guy who wants a do-it-all carbine that shoots flat and hits hard, but doesn’t want to mess with gas block adjustments or heavy parts kits. If you’re on a tractor, a side-by-side, or a fence line and need a rifle that stows tight and shoots far, this DISSENT is your tool.
Pros / Cons
- Pros: Lightweight for a long-range-capable rifle; folding stock for tight storage; 6mm ARC ammo is available from Hornady and others; reliable gas system out of the box; Cerakote finish holds up to weather and ranch grime.
- Cons: 6mm ARC ammo costs more than 5.56 NATO—about $1.50 per round for match loads. Also, the side-folding stock adds a little width when folded, so it’s not as slim as a fixed stock.
Comparison
| Feature | CMMG DISSENT MK4 6mm ARC | Geissele Super Duty 5.56 | Zev Technologies OZ9C |
|---|---|---|---|
| Caliber | 6mm ARC | 5.56 NATO | 9mm (pistol) |
| Barrel Length | 16.1 in | 16 in | 4.5 in |
| Weight | 7.2 lbs | 7.3 lbs | 1.8 lbs |
| Stock Type | Side-folding, adjustable | Fixed buffer tube | N/A (pistol) |
| Effective Range | 800+ yards | 600 yards | 50 yards |
| Price | $2,067.01 | $1,800 (approx) | $1,400 (approx) |
The Geissele is a proven 5.56 gun, but you don’t get the reach of 6mm ARC. The Zev is a pistol, not a rifle. This CMMG fills the gap between a lightweight carbine and a full-size long-range platform.
FAQ
What magazines does the CMMG 60AA90C-MB DISSENT MK4 6mm ARC use?
It uses standard AR-15 magazines. CMMG recommends 20-round magazines for best feeding with 6mm ARC, but 30-rounders work with some ammo. Check your specific load.
Can I swap the barrel or handguard later?
Yes, the MK4 handguard is removable with a standard barrel nut wrench, and the barrel is a direct-fit. But the ZEROED gas system is tuned to the 16.1-inch barrel, so swapping lengths may need a new gas port or adjustable gas block.
Does the side-folding stock work with a suppressor?
Yes, the stock folds to the right, so a suppressor on the left side still clears. The adjustable cheek riser helps with optic height when suppressed.
What is the twist rate and why does it matter?
1:7.5 twist. That’s fast enough to stabilize heavy 108-grain ELD-M and 112-grain Match Burner bullets, which are key for 800-yard accuracy. Slower twists won’t stabilize those projectiles.
Trust CMMG’s build quality. According to CMMG specs, the DISSENT line uses 7075-T6 aluminum receivers and a chrome-moly steel barrel with a QPQ finish. Over 200,000 CMMG rifles are in civilian and law enforcement hands, and the 6mm ARC chambering has been adopted by hunters and competitors for its flat trajectory and low recoil.
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Last updated: April 2026
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