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Availability: In Stock
Current Stock: Out of stock
The CMMG Dissent MK4 .300 AAC Blackout is a compact personal defense rifle that reimagines what an AR-pattern firearm can be. Built around CMMG's patent-pending Compact Action, this 6.50" barrel pistol ditches the traditional buffer tube entirely—the entire recoil system lives in the upper receiver, making the Dissent one of the most genuinely portable AR designs on the market. At 14.7" overall and just 4.8 lbs, it's a serious option for shooters who need serious capability in a seriously small package.
.300 AAC Blackout is the perfect cartridge for a gun like this. It delivers .30 caliber power across a wide range of loadings—hot supersonic rounds for hunting and distance, subsonic ammunition for suppressed work—and the SLR adjustable gas block lets you tune the system to run reliably with whatever you're feeding it. The included TriggerTech AR-D 2-Stage trigger (developed specifically for Dissent platforms) breaks cleanly at 4 lbs and was engineered to optimize this gun's handling. Ambidextrous controls, a non-reciprocating side charger that switches between left and right operation, and a 1913 Picatinny rail for brace or stock attachment round out a feature set built for real shooters, not marketing copy.
The Tungsten Gray Cerakote finish is durable and professional-looking, and the internals—7075 T6 aluminum receivers, 4140CM barrel, CMMG matched components—are built to the quality standard you'd expect from a brand known for American-made precision rifle work. This comes standard with a Magpul 30-round 300BLK PMAG, a CMMG ZEROED linear compensator (5/8 x 24 thread), and everything else you see is integrated into the platform. The Dissent MK4 is a tool for serious shooters who value compactness, modularity, and the freedom to configure their rifle their way.
| Caliber | .300 AAC Blackout |
| Barrel Length | 6.50" |
| Barrel Twist | 1:7 |
| Barrel Material | 4140CM SBN |
| Barrel Contour | MT |
| Gas Block | SLR Adjustable .750 |
| Gas System Type | Pistol gas port |
| Operating System | Compact Action Direct Impingement |
| Upper Receiver | DISSENT 7075 T6 Aluminum |
| Lower Receiver | Mk4 Forged 7075 T6 Aluminum |
| Handguard | CMMG 5.5" Proprietary |
| Charging Handle | DISSENT Side Charger (left) |
| Trigger | TriggerTech AR-D 2-Stage |
| Trigger Pull Weight | 4 lbs |
| Safety Selector | CMMG ZEROED 60/90 Degree |
| Pistol Grip | CMMG ZEROED |
| Trigger Guard | CMMG ZEROED |
| Muzzle Device | CMMG ZEROED Linear Compensator |
| Muzzle Thread | 5/8 x 24 |
| Receiver Extension | 1913 Picatinny Rail End Cap |
| Magazine | Magpul 300BLK 30-round PMAG |
| Finish | Tungsten Gray Cerakote |
| Length | 14.7" |
| Weight | 4.8 lbs |
| Platform | Mk4 |
The TriggerTech AR-D 2-Stage trigger that comes with your Dissent was developed specifically for this platform to optimize functionality with the Compact Action design. CMMG does not guarantee optimal Dissent functionality with Mil-spec or other aftermarket triggers, so we recommend sticking with the factory-installed trigger or consulting CMMG directly before making substitutions.
Yes. The SLR adjustable gas block on this rifle lets you fine-tune the gas system to run reliably with both supersonic and subsonic loadings. This is one of the key advantages of .300 Blackout in a tunable platform like the Dissent—you can dial it in for whatever ammunition type you're running.
The DISSENT side charger is non-reciprocating and can be switched between left and right-handed operation, so you can set it up for your preference.
The Dissent MK4 comes with a Magpul 30-round 300BLK PMAG and the CMMG ZEROED linear compensator already installed at the muzzle (5/8 x 24 thread). The rifle is ready to shoot once you add a brace or stock to the 1913 Picatinny rail at the rear.
SKU: 120912179 • Width: 11.2in • Height: 5.2in • Depth: 23.2in • Weight: 7.82oz
Availability: In Stock
Current Stock: Out of stock
The CMMG Dissent MK4 .300 AAC Blackout is a compact personal defense rifle that reimagines what an AR-pattern firearm can be. Built around CMMG's patent-pending Compact Action, this 6.50" barrel pistol ditches the traditional buffer tube entirely—the entire recoil system lives in the upper receiver, making the Dissent one of the most genuinely portable AR designs on the market. At 14.7" overall and just 4.8 lbs, it's a serious option for shooters who need serious capability in a seriously small package.
.300 AAC Blackout is the perfect cartridge for a gun like this. It delivers .30 caliber power across a wide range of loadings—hot supersonic rounds for hunting and distance, subsonic ammunition for suppressed work—and the SLR adjustable gas block lets you tune the system to run reliably with whatever you're feeding it. The included TriggerTech AR-D 2-Stage trigger (developed specifically for Dissent platforms) breaks cleanly at 4 lbs and was engineered to optimize this gun's handling. Ambidextrous controls, a non-reciprocating side charger that switches between left and right operation, and a 1913 Picatinny rail for brace or stock attachment round out a feature set built for real shooters, not marketing copy.
The Tungsten Gray Cerakote finish is durable and professional-looking, and the internals—7075 T6 aluminum receivers, 4140CM barrel, CMMG matched components—are built to the quality standard you'd expect from a brand known for American-made precision rifle work. This comes standard with a Magpul 30-round 300BLK PMAG, a CMMG ZEROED linear compensator (5/8 x 24 thread), and everything else you see is integrated into the platform. The Dissent MK4 is a tool for serious shooters who value compactness, modularity, and the freedom to configure their rifle their way.
| Caliber | .300 AAC Blackout |
| Barrel Length | 6.50" |
| Barrel Twist | 1:7 |
| Barrel Material | 4140CM SBN |
| Barrel Contour | MT |
| Gas Block | SLR Adjustable .750 |
| Gas System Type | Pistol gas port |
| Operating System | Compact Action Direct Impingement |
| Upper Receiver | DISSENT 7075 T6 Aluminum |
| Lower Receiver | Mk4 Forged 7075 T6 Aluminum |
| Handguard | CMMG 5.5" Proprietary |
| Charging Handle | DISSENT Side Charger (left) |
| Trigger | TriggerTech AR-D 2-Stage |
| Trigger Pull Weight | 4 lbs |
| Safety Selector | CMMG ZEROED 60/90 Degree |
| Pistol Grip | CMMG ZEROED |
| Trigger Guard | CMMG ZEROED |
| Muzzle Device | CMMG ZEROED Linear Compensator |
| Muzzle Thread | 5/8 x 24 |
| Receiver Extension | 1913 Picatinny Rail End Cap |
| Magazine | Magpul 300BLK 30-round PMAG |
| Finish | Tungsten Gray Cerakote |
| Length | 14.7" |
| Weight | 4.8 lbs |
| Platform | Mk4 |
The TriggerTech AR-D 2-Stage trigger that comes with your Dissent was developed specifically for this platform to optimize functionality with the Compact Action design. CMMG does not guarantee optimal Dissent functionality with Mil-spec or other aftermarket triggers, so we recommend sticking with the factory-installed trigger or consulting CMMG directly before making substitutions.
Yes. The SLR adjustable gas block on this rifle lets you fine-tune the gas system to run reliably with both supersonic and subsonic loadings. This is one of the key advantages of .300 Blackout in a tunable platform like the Dissent—you can dial it in for whatever ammunition type you're running.
The DISSENT side charger is non-reciprocating and can be switched between left and right-handed operation, so you can set it up for your preference.
The Dissent MK4 comes with a Magpul 30-round 300BLK PMAG and the CMMG ZEROED linear compensator already installed at the muzzle (5/8 x 24 thread). The rifle is ready to shoot once you add a brace or stock to the 1913 Picatinny rail at the rear.
SKU: 120912179 • Width: 11.2in • Height: 5.2in • Depth: 23.2in • Weight: 7.82oz