The CMMG Dissent Mk4 Upper in .22 ARC delivers a 16.10″ barrel paired with a reversible side charging handle and adjustable gas block. This upper houses the entire action and recoil assembly within the upper receiver through its patent-pending direct impingement Compact Action, creating a streamlined profile with reduced bulk relative to conventional AR platforms.
A 15″ M-LOK handguard and picatinny rail provide extensive space for mounting optics, lights, and accessories. The muzzle is fitted with a 1/2″x28 muzzle brake, and the 1:7 twist rate is optimized for .22 ARC ballistics. The upper pairs with any mil-spec compatible lower receiver and ships with a 1913 Picatinny rear end plate, allowing you to configure it as either a pistol or a compact carbine with stock attachment.
The adjustable gas block grants precise regulation of the gas system for suppressed shooting or tuning to your specific ammunition loads, maintaining reliable function matched to your shooting preferences. This upper showcases CMMG’s bufferless AR innovation, delivering a compact, modular platform with 22-250 level ballistics.
