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Most 9mm carbines are just AR pistols with a longer barrel bolted on. The CMMG Dissent BR4 takes a different road. Because CMMG's patented Compact Action tucks the recoil springs into the bolt carrier itself, there's no buffer tube hanging off the back, which opens the door for the Magpul SGA shoulder stock and gives the BR4 the feel of a traditional rifle with thoroughly modern guts underneath.
While other calibers in the Br4 family use direct impingement, the 9mm version runs CMMG's Radial Delayed Blowback system with a fixed ejector in the upper receiver. That matters because 9mm loadings are all over the map, from light subsonics to stout supersonic stuff, and this action digests the spread while shooting noticeably softer than a straight blowback gun. The 16.1 inch 4140CM steel barrel wears a black nitride finish, and the EMPIRE profile features a recessed crown to protect the rifling. Feeding comes from CMMG's 9mm conversion magazines, so the lower keeps a familiar AR-style magwell.
The reversible, non-reciprocating side charging handle keeps your optic mount clear and sets up for lefties or righties. Same story with the cross-bolt safety, which sits above the trigger where your finger naturally finds it. The ZEROED single stage drop-in trigger breaks crisp at around 4.5 pounds, a genuine step up from the gritty mil-spec triggers most factory carbines ship with. Up front, the 13.5 inch handguard gives you a full-length Picatinny top rail for optics and M-LOK slots for lights and accessories.
Here's the sleeper feature: the Br4 lower accepts any Mk4 Dissent upper group, so this can wear different calibers down the road. With STANAG-pattern uppers, the lower runs standard AR mags too. Fit and finish are what you'd expect from CMMG's billet 7075-T6 aluminum receivers in Armor Black Cerakote, and the whole package is backed by CMMG's Lifetime Quality Guarantee.
No, this one feeds from CMMG's 9mm conversion magazines, which fit the AR-style magwell on the Br4 lower. The upside is that the magwell stays standard, so if you ever swap to a different Mk4 Dissent upper group in another caliber, the lower will accept STANAG-pattern AR mags.
Yes. The BR4 uses a Remington 870 pattern stock mount, so it ships with the Magpul SGA and accepts other 870-footprint stocks if you want to change things up. Just keep in mind CMMG includes a raised cheek riser setup with the SGA to get proper eye alignment behind optics.
Noticeably softer. Instead of simple blowback, the 9mm Dissent BR4 runs CMMG's Radial Delayed Blowback Compact Action with a fixed ejector, which delays the bolt opening and takes a lot of the harshness out of the recoil impulse. It also handles a wide range of bullet weights, from subsonic to supersonic loads, without getting finicky.
Absolutely. The flattop upper and 13.5 inch handguard give you a continuous Picatinny rail on top, so red dots, LPVOs, and magnifier combos all mount easily. The non-reciprocating side charging handle means nothing cycles back toward your optic while you shoot, and the M-LOK slots handle lights and other accessories.
| UPC | 840442502461 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 94A610F-AB |
| Barrel Length | 16.1" |
| Caliber/Gauge | 9mm |
| Capacity | 10 + 1 |
| Safety | Crossbolt |
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