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CMMG took the AR formula, tossed the buffer tube, and built something genuinely different. The Dissent MK4 in .22 ARC runs on CMMG's patent-pending Compact Action, which tucks the entire recoil system inside the upper receiver. That opens the door for the DISSENT side folding stock out back, complete with adjustable length of pull and an adjustable cheek riser, so you can fold it flat for transport or dial it in for a proper cheek weld behind a scope. At 39.8 inches deployed, it stays handy without giving up the sight radius and velocity of a full 16.1 inch barrel.
The .22 ARC cartridge is the star here. Built on the 6.5 Grendel case, it pushes .22 caliber bullets at speeds chasing 22-250 territory, but from a detachable magazine semi-auto. The 16.1 inch 4140CM steel barrel wears a salt bath nitride finish and a 1:7 twist that stabilizes the heavier, high-BC bullets this cartridge was designed around. Translation: flat trajectories, mild recoil, and real reach for prairie dogs, coyotes, or steel way out past where most .223 loads start dropping fast. CMMG's Zeroed muzzle brake comes installed on 1/2-28 threads, and the adjustable gas block lets you tune the system for suppressed shooting or picky loads.
Instead of a rear charging handle, the Dissent uses a non-reciprocating forward side charger you can run without breaking your sight picture, and it's reversible if you'd rather have it on the other side. Ambidextrous controls and CMMG's Zeroed 60/90 degree safety keep manipulation quick from either shoulder, while the Zeroed drop-in single stage trigger gives you a clean factory break. The 7075-T6 aluminum receivers wear a sharp Midnight Bronze Cerakote finish, and the M-LOK handguard with full-length top Picatinny rail leaves plenty of room for glass, a light, and a bipod. Two 10-round magazines come in the box, so you're ready to zero the day it comes home.
The .22 ARC (Advanced Rifle Cartridge) is a modern .22 caliber centerfire round built on the 6.5 Grendel case. It delivers velocities approaching the 22-250 with a very flat trajectory and light recoil, but from a semi-auto with detachable magazines. That makes it a great fit for varmint and predator hunting, long-range steel, and anyone who wants serious reach without the thump.
The big change is CMMG's Compact Action, which houses the whole recoil system inside the upper receiver instead of a buffer tube. That's what allows the true side folding stock. It also swaps the rear charging handle for a non-reciprocating forward side charger you can work without coming off target, and it's reversible for left or right side use. Beyond that, the manual of arms feels familiar to any AR shooter.
Yes. The 16.1 inch barrel is threaded 1/2-28 and comes with CMMG's Zeroed muzzle brake installed, so mounting a can is straightforward. The adjustable gas block lets you tune the system down for suppressed use so it runs clean without excessive gas back at your face.
No. Because .22 ARC is based on the 6.5 Grendel case, it feeds from Grendel-pattern magazines rather than standard 5.56 mags. This model ships with two CMMG 10-round magazines, and quality Grendel-pattern mags in other capacities are widely available.
| UPC | 810148627218 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 28A490FMB |
| Action | |
| ATF Type | MODERN SPORTING RIFLE |
| Barrel Length | 16.1" |
| Caliber/Gauge | .22 ARC |
| Capacity | 10 + 1 |
| Color | MULTI-COLOR |
| Length | 39.8000 |
| Safety | CMMG Zeroed 60/90 Degree |
| Sights | No |
| State Restriction (IL) | NO SALE TO ILLINOIS PICA |
| State Restriction (RI) | NO DIRECT SHIP TO RHODE ISLAND |
| State Restriction (WA) | NO DIRECT SHIP TO WASHINGTON |
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