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CMMG's Dissent line took the AR-15 and rethought it from the receiver out, and this .22 ARC upper group is one of the more interesting ways to do it. Instead of the traditional buffer tube system, the Dissent houses the entire action and recoil assembly inside the upper receiver itself. That means no buffer tube sticking out the back, which opens the door to folding stocks, braces, or a slick pistol build. It ships with a 1913 Picatinny rail end plate that takes the place of the lower's buffer tube, so you're set up to configure the rear however you like once it's mated to a mil-spec compatible lower.
The .22 ARC, or Advanced Rifle Cartridge, is Hornady's take on getting real reach out of the AR-15 platform. Built off the 6mm ARC case and running a fast 1:7 twist, it stabilizes long, high-BC .224 bullets that stay flat and fight the wind at distance. Hornady positions it as delivering .22-250 style performance while still feeding from standard AR-15 magazines, and the 16.1-inch barrel on this upper gives that cartridge room to do its thing without turning into a boat anchor. It's a genuinely versatile round, at home on varmints, steel, and even medium game with the right load.
The forward non-reciprocating side charger lets you run the bolt without coming off target, and this direct impingement model comes with a left side charger standard. The adjustable gas block is where this upper earns its keep. Whether you're running a can or just tuning to a specific ammo, you can dial the gas exactly where you want it. Topping it off is a 15-inch M-LOK handguard with a full-length top Picatinny rail, giving you plenty of room for optics, lights, and whatever else the build calls for. The barrel wears a 1/2×28 threaded muzzle with a CMMG Zeroed muzzle brake, and every Dissent is backed by CMMG's lifetime quality guarantee.
Yes, this upper group is designed to pair with any mil-spec compatible AR-15 lower receiver. Because the Dissent runs its action and recoil assembly inside the upper, it also includes a 1913 Picatinny rail end plate that replaces the lower's buffer tube. That means you don't need a buffer, buffer spring, or receiver extension on the back of your lower.
The big difference is CMMG's bufferless Compact Action, which houses the entire recoil assembly within the upper receiver instead of using a traditional buffer tube. This lets you skip the receiver extension entirely and opens up folding stocks, braces, or a compact pistol build. It also uses a forward non-reciprocating side charging handle rather than a rear charging handle.
The .22 ARC was engineered by Hornady to deliver roughly .22-250 level ballistics from the AR-15 platform while still feeding from standard magazines. The 1:7 twist stabilizes heavy, high-BC .224 bullets that stay flat and resist wind at longer ranges. Out of a 16.1-inch barrel you get a nice balance of velocity and a handy overall length, making it a strong choice for varmints, target work, and even medium game with the right load.
It's well suited for suppressed shooting. The barrel comes with a 1/2×28 threaded muzzle wearing a CMMG Zeroed brake, so swapping to a can is straightforward. The adjustable gas block is the real advantage here, letting you tune the gas system down when running suppressed to keep cycling smooth and cut back on gas to the face.
| UPC | 810148627508 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 28B940CSG |
| Action | |
| Barrel Length | 16.1" |
| Caliber/Gauge | .22 ARC |
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