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CMMG
The CMMG Dissent MK4 6mm ARC rifle is a modern, lightweight AR-platform option built for shooters who want flat-shooting ballistics without the bulk and recoil of traditional large-frame rifle calibers. In 6mm ARC, this 16.1" rifle punches well above its weight class for hunting and longer-range work while maintaining the ergonomics and manual of arms you already know. At 6.4 lbs, the Dissent is compact enough to handle from truck to field, yet the direct impingement system and quality components deliver the accuracy and reliability that matter when a shot counts.
CMMG equipped this rifle with purpose-built ZEROED parts throughout—a drop-in trigger, adjustable gas block, and muzzle brake tuned for the 6mm ARC cartridge. The reversible Dissent side charger keeps your sight picture intact during charging, and the receiver end-cap Picatinny rail opens up optic and accessory mounting. Two 10-round magazines ship with the rifle, and the Jmac Customs padded folding stock makes it easy to stow without sacrificing a proper cheek weld when you need it. The 1:7.5 twist 416 stainless steel barrel is built to handle the round's velocity band, and the rifle comes finished in Armor Black Cerakote for a clean, professional look that works everywhere from the range to the field.
If you're tired of either under-gunned short-range setups or over-gunned, recoil-heavy magnums, the Dissent MK4 6mm ARC fills a real gap. It's an honest, no-nonsense rifle that leverages a proven platform to deliver performance in a package that's actually easy to carry and shoot all day.
| Caliber | 6mm ARC |
| Platform | Mk4 |
| Barrel Length | 16.1" |
| Barrel Material | 416 Stainless Steel |
| Barrel Twist | 1:7.5 |
| Barrel Contour | MT |
| Overall Length | 26.3" |
| Weight | 6.4 lbs |
| Operating System | Direct Impingement |
| Gas Block | Adjustable 0.750" |
| Gas Port Location | Rifle |
| Upper Receiver | CMMG DISSENT 7075 T6 Aluminum |
| Lower Receiver | Mk4 Forged 7075 T6 Aluminum |
| Handguard | CMMG 15" Proprietary |
| Charging Handle | DISSENT Side Charger, Reversible |
| Trigger | CMMG ZEROED Drop-In |
| Trigger Guard | CMMG ZEROED |
| Safety Selector | CMMG ZEROED, 60/90 Degree |
| Pistol Grip | CMMG ZEROED |
| Stock | Jmac Customs Padded Folding |
| Muzzle Device | CMMG ZEROED Muzzle Brake |
| Muzzle Thread | 5/8 x 24 |
| Receiver Extension | 1913 Picatinny Rail End Cap |
| Magazines Included | Two 10-round CMMG magazines |
| Finish | Armor Black Cerakote |
6mm ARC (Advanced Rifle Cartridge) is a modern cartridge purpose-built for the AR-15 platform. It delivers flat trajectory and effective range comparable to traditional rifle rounds like .243 Win, while remaining in a short-action rifle format. The Dissent MK4 is optimized for 6mm ARC ballistics with a 1:7.5 twist barrel and adjustable gas system, making it capable for hunting applications where you'd normally choose a heavier rifle.
Yes. The Dissent MK4 features a Jmac Customs padded folding stock, which allows you to collapse it for compact carry and storage. The stock is padded for comfort during shooting when deployed.
The rifle ships with two 10-round CMMG magazines and uses CMMG magazines designated for 6mm ARC.
The Dissent MK4 comes with a CMMG ZEROED muzzle brake with 5/8 x 24 threads, which can be removed and replaced with other devices—like a suppressor—that share the same thread pitch. The rifle also features a Picatinny rail end-cap on the receiver extension for mounting slings and other accessories.
CMMG
The CMMG Dissent MK4 6mm ARC rifle is a modern, lightweight AR-platform option built for shooters who want flat-shooting ballistics without the bulk and recoil of traditional large-frame rifle calibers. In 6mm ARC, this 16.1" rifle punches well above its weight class for hunting and longer-range work while maintaining the ergonomics and manual of arms you already know. At 6.4 lbs, the Dissent is compact enough to handle from truck to field, yet the direct impingement system and quality components deliver the accuracy and reliability that matter when a shot counts.
CMMG equipped this rifle with purpose-built ZEROED parts throughout—a drop-in trigger, adjustable gas block, and muzzle brake tuned for the 6mm ARC cartridge. The reversible Dissent side charger keeps your sight picture intact during charging, and the receiver end-cap Picatinny rail opens up optic and accessory mounting. Two 10-round magazines ship with the rifle, and the Jmac Customs padded folding stock makes it easy to stow without sacrificing a proper cheek weld when you need it. The 1:7.5 twist 416 stainless steel barrel is built to handle the round's velocity band, and the rifle comes finished in Armor Black Cerakote for a clean, professional look that works everywhere from the range to the field.
If you're tired of either under-gunned short-range setups or over-gunned, recoil-heavy magnums, the Dissent MK4 6mm ARC fills a real gap. It's an honest, no-nonsense rifle that leverages a proven platform to deliver performance in a package that's actually easy to carry and shoot all day.
| Caliber | 6mm ARC |
| Platform | Mk4 |
| Barrel Length | 16.1" |
| Barrel Material | 416 Stainless Steel |
| Barrel Twist | 1:7.5 |
| Barrel Contour | MT |
| Overall Length | 26.3" |
| Weight | 6.4 lbs |
| Operating System | Direct Impingement |
| Gas Block | Adjustable 0.750" |
| Gas Port Location | Rifle |
| Upper Receiver | CMMG DISSENT 7075 T6 Aluminum |
| Lower Receiver | Mk4 Forged 7075 T6 Aluminum |
| Handguard | CMMG 15" Proprietary |
| Charging Handle | DISSENT Side Charger, Reversible |
| Trigger | CMMG ZEROED Drop-In |
| Trigger Guard | CMMG ZEROED |
| Safety Selector | CMMG ZEROED, 60/90 Degree |
| Pistol Grip | CMMG ZEROED |
| Stock | Jmac Customs Padded Folding |
| Muzzle Device | CMMG ZEROED Muzzle Brake |
| Muzzle Thread | 5/8 x 24 |
| Receiver Extension | 1913 Picatinny Rail End Cap |
| Magazines Included | Two 10-round CMMG magazines |
| Finish | Armor Black Cerakote |
6mm ARC (Advanced Rifle Cartridge) is a modern cartridge purpose-built for the AR-15 platform. It delivers flat trajectory and effective range comparable to traditional rifle rounds like .243 Win, while remaining in a short-action rifle format. The Dissent MK4 is optimized for 6mm ARC ballistics with a 1:7.5 twist barrel and adjustable gas system, making it capable for hunting applications where you'd normally choose a heavier rifle.
Yes. The Dissent MK4 features a Jmac Customs padded folding stock, which allows you to collapse it for compact carry and storage. The stock is padded for comfort during shooting when deployed.
The rifle ships with two 10-round CMMG magazines and uses CMMG magazines designated for 6mm ARC.
The Dissent MK4 comes with a CMMG ZEROED muzzle brake with 5/8 x 24 threads, which can be removed and replaced with other devices—like a suppressor—that share the same thread pitch. The rifle also features a Picatinny rail end-cap on the receiver extension for mounting slings and other accessories.
