CMMG Dissent MK4 300 Blackout 10.5" Upper
CMMG's innovative Dissent MK4 upper receiver in 300 Blackout features a compact radial delayed blowback action, left-side charging handle, and 9.6" M-LOK handguard. Includes linear compensator and Picatinny end plate.
CMMG Dissent MK4 Upper Receiver Group
The Dissent represents a thoughtful answer to the evolving regulatory landscape surrounding AR pistol configurations. CMMG engineered this upper receiver group to house the complete action and recoil assembly within the upper itself, eliminating the need for traditional buffer tube components.
Key Features
- Radial Delayed Blowback Action: CMMG's patent-pending Compact Action technology delivers reliable operation in a compact package
- Fixed Ejector Design: Ensures consistent brass ejection without moving parts
- Left-Side Charging Handle: Non-reciprocating design allows manipulation without breaking your sight picture
- 300 Blackout Caliber: Optimized for subsonic and supersonic ammunition
- 10.5" Barrel: Compact length suitable for close-quarters work
- 9.6" M-LOK Handguard: Lightweight rail system for mounting accessories
- Zeroed Linear Compensator: Reduces muzzle rise while minimizing blast signature
- Picatinny End Plate: Allows mounting to compatible lower receivers without buffer tube
- Armor Black Finish: Durable coating resists corrosion
Design Philosophy
This upper receiver group delivers less bulk and length than conventional AR pistol designs while maintaining the modularity shooters expect. The forward charging handle keeps your support hand in a natural position, and the compact action design maximizes usable space for optics and accessories.
Perfect for builders seeking a modern, purpose-built upper receiver that addresses contemporary concerns about AR pistol configurations.
