CMMG Dissent Mk3
CMMG Inc. · Rifle · In Production · 2024
Overview
The CMMG Dissent Mk3 is the large-frame, AR-10 size member of CMMG's bufferless Compact Action family, chambered in .308 Winchester, 6.5 Creedmoor, and 8.6 Blackout. Engineering the buffer-tube-free Compact Action for a full-power .308-class cartridge required evolving the AR-10 direct-impingement bolt carrier group into a compact form cycled by dual guide rods and springs in the upper receiver. The result is a folding-stock-capable big-bore semi-auto: the 16.1-inch-barreled .308 weighs about 8.5 pounds and folds to roughly 28 inches via the Dissent folding stock adapter. The Mk3 features a reversible ambidextrous side charging handle, adjustable gas block, M-LOK free-float handguard, and 7075-T6 aluminum receivers with Cerakote finish, feeding from 20-round Magpul PMAG LR/SR magazines. The 8.6 Blackout configuration uses a fast 1:3 twist barrel optimized for heavy subsonic .338 projectiles, while .308 and 6.5 Creedmoor use 1:10 and 1:8 twists respectively. Barrel lengths range from 12.5 inches up to 20 inches.
Specifications
| Weight (empty) | 3856 g (136.0 oz) |
| Weight (loaded) | 4156 g (146.6 oz) |
| Overall Length | 879 mm (34.61") |
| Folded Length | 716 mm (28.19") |
| Barrel Length | 409 mm (16.10") |
| Action Type | Gas Operated Direct Impingement |
| Firing Mechanism | Hammer Fired |
| Trigger Type | Two Stage |
| Trigger Pull | 18 N (4.0 lbf) |
| Magazine Capacity | 20 rounds |
| Magazine Type | Detachable Box |
| Muzzle Velocity | 838 m/s (2749 fps) |
| Muzzle Energy | 3406 J (2512 ft·lbf) |
| Effective Range | 700 m (766 yd) |
| Maximum Range | 4700 m (5140 yd) |
| Barrel Rifling | Right Hand |
| Rifling Twist | 254 mm (10.00") |
| Number of Grooves | 6 |
| Frame Material | Aluminum Alloy |
| Barrel Material | Steel |
| Stock Material | Polymer |
| Finish | Cerakote |
Calibers
- .308 Winchester · primary · 7.62x51mm NATO — also known as 7.62x51mm NATO, 7.62 NATO, .308 Win
- 6.5mm Creedmoor — also known as 6.5 Creedmoor, 6.5 CM
Features
- Firing modes: Semi Automatic
- Feed systems: Detachable Box Magazine
- Safety mechanisms: Manual Safety Selector, Firing Pin Safety
- Features: M Lok Handguard, Free Floating Handguard, Ambidextrous Controls, Picatinny Rail, Threaded Barrel, Folding Stock, Two Stage Trigger, Muzzle Brake, Side Charging Handle, Adjustable Gas System
Variants
- Dissent Mk3 6.5 Creedmoor — Caliber Variant
- Dissent Mk3 8.6 Blackout — Caliber Variant
- Dissent Mk3 20" — Barrel Length
- Dissent Br3 (compliant) — Compliance
Production
Production years: 2024-present
Exact production numbers not disclosed by CMMG.
Origin
Country of origin: United States
Notes
MSRP approximately $2,349. The Dissent Mk3 is the large-frame bufferless rifle; the 8.6 Blackout chambering (1:3 twist) is purpose-built for heavy subsonic loads and pairs well with suppressors. The Br3 sub-variant is a compliant, non-threaded, fixed-stock configuration for restrictive states.
Background
Adapting the bufferless Compact Action to the recoil and bolt mass of a .308-class cartridge was a significant engineering milestone, letting CMMG offer a genuinely folding AR-10 - something the conventional buffer-tube design cannot do.