CMMG Dissent MK4 300 Blackout Upper Receiver

CMMG Dissent MK4 Upper Receiver – 300 Blackout

The Dissent represents CMMG's thoughtful answer to the evolving landscape of compact AR platforms. This upper receiver group houses the entire action and recoil assembly within the receiver itself, eliminating the need for traditional buffer tube systems and resulting in a more compact, efficient design.

Key Features

• Compact Action Design: CMMG's patent-pending Compact Action and Radial Delayed Blowback system delivers reliable operation in a reduced footprint
• Fixed Ejector: Consistent, dependable case ejection without moving parts
• Left-Side Charging Handle: Non-reciprocating design allows quick bolt manipulation while maintaining sight picture
• 6.5" Barrel: 300 Blackout chambering optimized for both supersonic and subsonic ammunition
• Linear Compensator: Reduces muzzle rise and blast signature
• 4.60" M-LOK Handguard: Lightweight rail system with multiple mounting options for accessories
• Picatinny End Plate: Allows mounting of optics or other rail-mounted devices directly to the upper
• Armor Black Finish: Durable, corrosion-resistant coating

Compatibility

This upper receiver group is designed to work with standard AR-platform lower receivers. The included Picatinny rail end plate replaces the traditional buffer tube, making it an excellent choice for builders seeking a modern, compact platform.

Why Choose the Dissent?

If you've been considering an AR pistol but want to avoid the uncertainties surrounding stabilizing braces, the Dissent offers a purpose-built alternative that delivers genuine innovation in compact rifle design.