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The DISSENT MK4 is CMMG's answer to the question of what an AR pistol looks like when you stop designing around a buffer tube. Their patent-pending Compact Action tucks the entire recoil system inside the upper receiver, so the back of the gun ends in a 1913 Picatinny rail plate instead of a receiver extension. That trims real length off the platform and opens the door to mounting a folding brace flat against the receiver. Pair that layout with .300 Blackout, a cartridge that burns its powder happily in short barrels, and you get a package that makes a lot of sense.
The 10.5 inch 4140CM barrel wears a salt bath nitride finish and a 1:7 twist, which stabilizes everything from light supersonic loads to heavy 220 grain subsonics. The muzzle is threaded 5/8×24 and comes capped with CMMG's Zeroed linear compensator, which pushes blast and concussion forward instead of back at you. Swap it for a can and the adjustable gas block earns its keep, letting you fine tune the system so it runs clean whether you are feeding it quiet subs or full power supersonic ammo.
Charging duty is handled by a forward mounted, non-reciprocating side charger, so you can run the bolt without breaking your grip or coming off target. Ambidextrous controls keep things friendly for lefties, and the M-LOK handguard with a full top rail gives you plenty of space for lights, lasers, and a hand stop. The trigger is a TriggerTech AR-D, developed specifically for the DISSENT platform, breaking at a crisp 4 pounds.
Both receivers are machined from 7075-T6 aluminum and dressed in a Tungsten grey Cerakote finish that looks sharp and shrugs off wear. Overall length comes in around 18.7 inches, so it stores and transports easily. Like everything CMMG builds, it is covered by their Lifetime Quality Guarantee, which says a lot about how much confidence they have in this design.
The big difference is the Compact Action. Instead of a buffer tube hanging off the back, the entire recoil system lives inside the upper receiver, so the rear of the gun is just a flat 1913 Picatinny rail plate. That shaves length off the platform and lets you attach a folding brace that sits flush against the receiver.
That is really where this gun shines. The 300 Blackout DISSENT comes with an adjustable gas block, so you can tune the gas system for subsonic loads with a can attached, then dial it back for supersonic ammo. The 5/8×24 threaded muzzle makes swapping the included linear comp for a suppressor simple.
CMMG designed this platform around the TriggerTech AR-D, a 4 pound single stage trigger built specifically for the DISSENT's Compact Action. CMMG does not guarantee reliable function with mil-spec or other aftermarket triggers, so the smart move is to stick with the AR-D that comes installed. The good news is it is an excellent trigger with a light, repeatable break.
It feeds from standard AR-15 pattern magazines, so your existing 5.56 mags will work with 300 Blackout ammo. That said, dedicated 300 Blackout magazines like Magpul's 300BLK PMAGs are a good idea since their geometry is optimized for the cartridge and they help keep your ammo clearly separated from 5.56.
| UPC | 810097509702 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 30AC278TNG |
| Action | |
| Barrel Length | 10.5" |
| Caliber/Gauge | .300 AAC Blackout |
| Capacity | 30 + 1 |
| Safety | Lever Action |
| Sights | Optic Ready |
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