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CMMG
The CMMG Dissent MK4 300 BLK 14.5" pistol in Armor Black is a purpose-built short-range AR-platform firearm engineered for shooters who want full cartridge performance in a compact, maneuverable package. The 300 BLK cartridge thrives in shorter barrels, and CMMG's 14.5" barrel with 1:7 twist delivers the velocity this round was designed for—without the bulk of a traditional rifle. The factory-pinned and welded ZEROED SVD brake extends the overall length to 16.1", keeping you clear of NFA hassles if you prefer to run it sans brace.
What sets the Dissent apart is its non-reciprocating side-charging handle, a patent-pending design that lets you manipulate the bolt carrier from either flank without your firing hand leaving the grip. That flexibility matters in tight quarters or when shooting from barricades. The Dissent uses CMMG's proprietary Compact Action—no buffer tube, no traditional buffer spring—replacing them with a 1913 Picatinny rail end plate that accepts folding stocks, braces, slings, and other accessories you choose. Both upper and lower receivers are forged 7075-T6 aluminum, and the 13.5" proprietary handguard keeps the platform sleek and controllable.
The adjustable gas block is a smart touch for 300 BLK versatility. Whether you're running supersonic or subsonic loads—especially important if you're shooting suppressed—you can fine-tune the system to cycle reliably. The gun ships with two Magpul 30-round PMags, a ZEROED drop-in trigger, reversible safety selector, and a ZEROED pistol grip. At 6 lbs and 24.9" overall, the Dissent balances firepower with handling ease for close-quarters work, hunting in brush, or home defense applications where a dedicated 300 BLK platform makes sense.
| Caliber | .300 BLK |
| Platform | Mk4 |
| Barrel Length | 14.5" |
| Overall Length | 24.9" |
| Barrel Twist | 1:7 |
| Barrel Material | 4140CM SBN |
| Barrel Contour | MT |
| Muzzle Device | CMMG ZEROED SVD Brake, pinned and welded |
| Muzzle Thread | 5/8 x 24 |
| Gas System | Direct Impingement, carbine gas port location |
| Gas Block | Adjustable 0.750" |
| Operating System | Direct Impingement |
| Upper Receiver | DISSENT 7075-T6 Aluminum |
| Lower Receiver | Mk4 Forged 7075-T6 Aluminum |
| Handguard | CMMG 13.5" Proprietary |
| Charging Handle | Dissent Side Charger, reversible/non-reciprocating |
| Trigger | ZEROED Drop-In |
| Trigger Guard | CMMG ZEROED |
| Safety Selector | CMMG ZEROED 60/90 Degree |
| Pistol Grip | CMMG ZEROED |
| Receiver Extension | 1913 Picatinny Rail End Cap |
| Weight | 6.0 lbs |
| Finish | Cerakote Armor Black |
| Included Magazines | Two Magpul 300 BLK 30-round PMags |
Yes. The Compact Action replaces the traditional buffer tube with a 1913 Picatinny rail end cap, which accepts a wide variety of folding stocks, braces, and other rail-mounted accessories. The pinned and welded SVD brake brings the overall length to 16.1", so you can legally run most configurations without NFA registration.
The side-charging handle is reversible and can be manipulated from either the left or right flank. This allows you to configure it for left or right-hand operation and work the bolt while maintaining your grip and sight picture.
The 300 BLK Dissent comes with an adjustable gas block so you can fine-tune the system for both supersonic (standard velocity) and subsonic ammunition loads. This is especially useful if you plan to shoot suppressed, as subsonic ammo benefits from a tighter gas setting.
The Dissent MK4 300 BLK pistol ships with two Magpul 30-round PMags chambered in 300 BLK, a ZEROED drop-in trigger, ZEROED pistol grip, and ZEROED trigger guard already installed.
CMMG
The CMMG Dissent MK4 300 BLK 14.5" pistol in Armor Black is a purpose-built short-range AR-platform firearm engineered for shooters who want full cartridge performance in a compact, maneuverable package. The 300 BLK cartridge thrives in shorter barrels, and CMMG's 14.5" barrel with 1:7 twist delivers the velocity this round was designed for—without the bulk of a traditional rifle. The factory-pinned and welded ZEROED SVD brake extends the overall length to 16.1", keeping you clear of NFA hassles if you prefer to run it sans brace.
What sets the Dissent apart is its non-reciprocating side-charging handle, a patent-pending design that lets you manipulate the bolt carrier from either flank without your firing hand leaving the grip. That flexibility matters in tight quarters or when shooting from barricades. The Dissent uses CMMG's proprietary Compact Action—no buffer tube, no traditional buffer spring—replacing them with a 1913 Picatinny rail end plate that accepts folding stocks, braces, slings, and other accessories you choose. Both upper and lower receivers are forged 7075-T6 aluminum, and the 13.5" proprietary handguard keeps the platform sleek and controllable.
The adjustable gas block is a smart touch for 300 BLK versatility. Whether you're running supersonic or subsonic loads—especially important if you're shooting suppressed—you can fine-tune the system to cycle reliably. The gun ships with two Magpul 30-round PMags, a ZEROED drop-in trigger, reversible safety selector, and a ZEROED pistol grip. At 6 lbs and 24.9" overall, the Dissent balances firepower with handling ease for close-quarters work, hunting in brush, or home defense applications where a dedicated 300 BLK platform makes sense.
| Caliber | .300 BLK |
| Platform | Mk4 |
| Barrel Length | 14.5" |
| Overall Length | 24.9" |
| Barrel Twist | 1:7 |
| Barrel Material | 4140CM SBN |
| Barrel Contour | MT |
| Muzzle Device | CMMG ZEROED SVD Brake, pinned and welded |
| Muzzle Thread | 5/8 x 24 |
| Gas System | Direct Impingement, carbine gas port location |
| Gas Block | Adjustable 0.750" |
| Operating System | Direct Impingement |
| Upper Receiver | DISSENT 7075-T6 Aluminum |
| Lower Receiver | Mk4 Forged 7075-T6 Aluminum |
| Handguard | CMMG 13.5" Proprietary |
| Charging Handle | Dissent Side Charger, reversible/non-reciprocating |
| Trigger | ZEROED Drop-In |
| Trigger Guard | CMMG ZEROED |
| Safety Selector | CMMG ZEROED 60/90 Degree |
| Pistol Grip | CMMG ZEROED |
| Receiver Extension | 1913 Picatinny Rail End Cap |
| Weight | 6.0 lbs |
| Finish | Cerakote Armor Black |
| Included Magazines | Two Magpul 300 BLK 30-round PMags |
Yes. The Compact Action replaces the traditional buffer tube with a 1913 Picatinny rail end cap, which accepts a wide variety of folding stocks, braces, and other rail-mounted accessories. The pinned and welded SVD brake brings the overall length to 16.1", so you can legally run most configurations without NFA registration.
The side-charging handle is reversible and can be manipulated from either the left or right flank. This allows you to configure it for left or right-hand operation and work the bolt while maintaining your grip and sight picture.
The 300 BLK Dissent comes with an adjustable gas block so you can fine-tune the system for both supersonic (standard velocity) and subsonic ammunition loads. This is especially useful if you plan to shoot suppressed, as subsonic ammo benefits from a tighter gas setting.
The Dissent MK4 300 BLK pistol ships with two Magpul 30-round PMags chambered in 300 BLK, a ZEROED drop-in trigger, ZEROED pistol grip, and ZEROED trigger guard already installed.
