The CMMG Dissent MK4 is an AR-pattern firearm chambered in .300 AAC Blackout with a 6.5-inch barrel in a short-barreled configuration; transfer requires additional federal paperwork. It uses a 7075-T6 aluminum receiver and ships with a 30-round magazine. The proprietary 5.5-inch handguard and Black Cerakote finish are standard. 
 

Key Specifications 

• Brand: CMMG 
• Model: Dissent MK4 
• Caliber: .300 AAC Blackout 
• Action: Semi Auto 
• Capacity: 30 rounds 
• Barrel Length: 6.5 inches 
• Color/Finish: Black Cerakote 
   

Detailed Features 

• 6.5-inch barrel in a short-barreled configuration (additional federal transfer paperwork required) 
• 7075-T6 aluminum receiver construction 
• 5.5-inch proprietary handguard 
• Black Cerakote finish on all metal surfaces 
• Ships with CMMG Zeroed Grip and 30-round magazine

Owners of the Dissent MK4 in .300 Blackout consistently point to the 7075-T6 aluminum construction as one of the platform's clear strengths. The Cerakote finish holds up well to handling, and the proprietary handguard gets mixed feedback: some find the shorter profile ideal for a compact build, while others wish for a more standard mounting system.

The 6.5-inch barrel draws interest from suppressor hosts, and many MK4 owners pair this configuration with a can. The CMMG Zeroed Grip is a small but appreciated inclusion. The short-barreled nature means the transfer process adds time and cost that buyers need to account for before purchase.

Value perception on the Dissent MK4 sits in a mixed place. CMMG's quality control reputation is generally good, but the platform commands a price that some feel is steep compared to budget AR builds in the same caliber. Aftermarket support is reasonable, though the proprietary handguard limits some customization paths.