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The .338 ARC is one of the more interesting cartridges to hit the AR world in a while, and the CMMG Dissent BR4 is a natural home for it. Hornady built the round by necking up the 6mm ARC case to take a .338 bullet, and the result runs reliably in both subsonic and supersonic loads with no changes to the gun. Subsonic 307-grain loads are about as quiet as .300 Blackout through a can but carry roughly 1.5 times the energy, while the lighter 175-grain supersonic load stretches your effective range out past 300 yards. For hogs, deer, and property work where noise matters, that kind of flexibility in one rifle is hard to beat.
The Dissent platform ditches the traditional AR buffer tube. CMMG's Compact Action uses dual guide rods and springs housed inside the upper receiver, which shortens the overall package and lets the Br4 lower run a Remington 870-pattern stock instead of a receiver extension. This one wears a Magpul SGA 870 stock in black synthetic. You also get a reversible, non-reciprocating side charging handle up front, so you can run the bolt without pulling off target, and swap it to the other side if you shoot lefty.
The 16.1-inch barrel is 4140CM steel with a nitride finish and a 1:8 twist, which handles the long, heavy .338 projectiles nicely and gives handloaders room to work with traditional .338 bullets. It wears a CMMG ZEROED muzzle brake on 5/8×24 threads and runs an adjustable gas block, which is a real plus when you're switching between subsonic and supersonic ammo or adding a suppressor. The DISSENT Mk4 upper and Br4 billet lower are both 7075 T6 aluminum finished in Coyote Tan Cerakote, with a full-length Picatinny top rail and a 15-inch M-LOK handguard for mounting optics, lights, and bipods.
Rounding things out is a ZEROED drop-in trigger, integrated trigger guard, and a reversible cross-bolt safety. At 7.9 pounds and 37.5 inches overall, it's a maneuverable carbine that works just as well on a hunting stand as it does as a home-defense gun. New and experienced shooters alike will find it easy to run.
Yes, that versatility is the whole point of the .338 ARC cartridge. The rifle runs both subsonic 307-grain loads and supersonic 175-grain loads with no modifications, and the adjustable gas block helps you fine-tune the system. Subsonic rounds are great for quiet, suppressed work while supersonic loads extend your range considerably.
The Dissent uses CMMG's Compact Action, which replaces the traditional buffer tube with dual guide rods and springs built into the upper receiver. That shortens the overall package and lets the Br4 lower accept a Remington 870-pattern stock like the Magpul SGA. You also get a reversible, non-reciprocating side charging handle instead of the usual rear AR charging handle.
It's a solid choice for short-to-medium range hunting on hogs, deer, and similar-sized game. The heavy .338 subsonic bullets deliver reliable expansion and plenty of energy out to around 200 yards, while supersonic loads push effective range past 300. It shines in situations where a suppressor and low noise are a priority.
The 16.1-inch barrel is threaded 5/8×24 and ships with a CMMG ZEROED muzzle brake installed. That standard thread pitch makes it easy to mount a .338-rated suppressor, and the adjustable gas block lets you tune the gun for suppressed shooting.
| UPC | 840442507091 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 34A670FCT |
| Action | |
| Barrel Length | 16.1" |
| Caliber/Gauge | .338 ARC |
| Capacity | 10 + 1 |
| Safety | Reversible Crossbolt |
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