CMMG Dissent MK3 8.6 Blackout 12.5" Barrel 20rd Magazine

The CMMG Dissent MK3 delivers precision engineering in the increasingly popular 8.6 Blackout caliber, combining compact dimensions with serious performance capabilities. This platform addresses the demand for a versatile firearm that excels in both subsonic and supersonic applications while maintaining reliability across diverse shooting scenarios.

What Makes This Different

The Dissent MK3 utilizes CMMG's proven direct impingement system specifically tuned for 8.6 Blackout's unique ballistics. The 12.5-inch barrel length provides optimal velocity for this cartridge while keeping overall length manageable. Unlike standard AR platforms adapted for this caliber, the Dissent features purpose-built components that maximize the 8.6 Blackout's subsonic potential and suppressor compatibility.

Key Features

• 12.5-inch black nitride barrel optimized for 8.6 Blackout ballistics
• 7075-T6 aluminum upper and lower receivers for durability and weight reduction
• 11-inch proprietary M-LOK handguard with integrated mounting points
• 20-round magazine capacity with reliable feeding geometry
• CMMG Zeroed grip designed for consistent hand placement
• Black nitride finish provides corrosion resistance and reduced maintenance
• Standard AR-15 trigger group compatibility for customization options

Field performance centers on the 8.6 Blackout's versatility across subsonic and supersonic loads. The barrel length provides complete powder burn for supersonic rounds while maintaining sufficient velocity for effective terminal performance. Subsonic loads cycle reliably through the tuned gas system, making this platform particularly effective when sound signature matters. The rigid handguard system maintains zero consistency across extended shooting sessions.

Technical Specs

• Caliber: 8.6 Blackout (.338 caliber)
• Barrel Length: 12.5 inches with 1:7 twist rate
• Overall Length: Approximately 32 inches (stock extended)
• Weight: Approximately 6.8 pounds unloaded
• Receiver Material: 7075-T6 aluminum, Type III hard coat anodized
• Handguard: 11-inch M-LOK compatible with anti-rotation design
• Magazine Capacity: 20 rounds
• Thread Pattern: 5/8x24 TPI for suppressor compatibility
• Gas System: Carbine length, direct impingement
• Made in USA with lifetime warranty

The Dissent MK3 represents CMMG's commitment to purpose-built firearms rather than simple caliber conversions. Current market demand for 8.6 Blackout platforms continues growing as shooters recognize the cartridge's capabilities, making proven platforms increasingly valuable.