CMMG Dissent Mk4 Pistol – .300 AAC Blackout, 6.5″

About this product

The CMMG Dissent Mk4 is a compact, buffer-less AR pistol built around CMMG’s patent-pending Compact Action that houses the recoil system in the upper receiver. Chambered in .300 AAC Blackout, this Mk4 configuration pairs a 6.5-inch free‑floated barrel with a 5.5-inch M-LOK handguard for a highly stowable Personal Defense Weapon form factor. It retains AR‑style ergonomics, ambidextrous controls, and a forward non-reciprocating side charger configurable for left or right-handed operation.

Key Specifications

• The caliber is .300 AAC Blackout.
• The barrel measures 6.5 inches.
• The handguard is a 5.5-inch M-LOK free‑floated design.
• The action is Semi‑Auto.
• Safety is Ambidextrous for right- and left-handed use.
• Includes two Magpul PMAG magazines with the pistol package.
• The weight is listed as 76 oz.
• Overall length is 14.7 inches.
• The muzzle is threaded 5/8-24 and ships with CMMG’s Zeroed linear muzzle device.
• Finish is a Cerakote Armor Black treatment.

The Dissent Mk4 delivers a compact, modular platform well suited to users who prioritize portability and configurability. Its Compact Action removes the buffer tube, enabling a shorter, more stowable pistol while retaining AR controls and accessory compatibility on a standard Picatinny optic footprint. With an adjustable gas block and a purpose-built trigger, this configuration offers refined function in a small package for responsible, practical use.

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