The CMMG Dissent Mk4 is a compact AR-format pistol chambered in .300 AAC Blackout with a 6.5″ barrel. It employs CMMG’s patent-pending Compact Action to house the recoil system in the upper receiver, eliminating the buffer tube for a shorter, more modular package. The platform includes a forward non-reciprocating side charger that can be configured for left- or right-handed operation and a 1913 Picatinny rail at the rear of the lower for mounting a brace or stock where permitted.
Key Specifications
- The caliber is .300 AAC Blackout.
- The barrel measures 6.5 inches.
- The barrel twist rate is 1:7.
- The operating system is Compact Action — Direct Impingement.
- The gas block is an SLR adjustable .750 unit for tuning supersonic or subsonic loads.
- The muzzle thread pattern is 5/8 x 24.
- The upper receiver is DISSENT 7075 T6 aluminum.
- The lower is a Mk4 forged 7075 T6 aluminum lower receiver.
- The handguard is a CMMG 5.5″ proprietary M-LOK design.
- The trigger is a TriggerTech AR-D 2-stage unit developed with CMMG.
This Dissent Mk4 configuration is built for compact portability without sacrificing the modular features shooters expect from an AR platform. Its adjustable gas system and dedicated muzzle device support a range of .300 BLK loadings, while ambidextrous controls and the side charger increase operational flexibility. The package is finished in Cerakote black with CMMG-zeroed furniture and accessory interfaces to accept optics and attachments as needed.
Product information is supplied by the manufacturer and/or distributor and may be automatically formatted or enhanced using AI for clarity and consistency. While we strive for accuracy, specifications, features, and included items may change without notice. Always verify details using the manufacturer’s official documentation and the information shown on this product page before purchase or use.
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