The CMMG Dissent Mk4 (brand part no. 55A8D40-AB) is a 5.56 NATO AR pistol built around CMMG’s patent-pending direct impingement Compact Action, which houses the entire action and recoil system inside the upper receiver and eliminates the buffer tube entirely. That design keeps the 10.5-inch-barreled Dissent genuinely compact without sacrificing the capability of a full AR-15 platform, and makes it a strong candidate for shooters running a suppressor or fine-tuning the system for their needs. An ambidextrous manual safety and a 30-round magazine round out a pistol built for home defense, range use, or a dedicated short-barrel build. It’s one of the more distinctive designs in the AR pistols lineup from CMMG.

Key Specifications

• Chambered in .223 Rem/5.56 NATO for widely available ammunition.
• Features a 10.5-inch barrel for a compact, maneuverable footprint.
• Ships with a 30-round magazine for a full carbine-style load.
• Built on CMMG’s buffer-free Compact Action, housing the entire action in the upper receiver.
• Features an ambidextrous manual safety for shooters of either hand.
• Features an adjustable gas block to fine-tune the system for suppressed or unsuppressed fire.
• Runs a TriggerTech AR-D trigger developed specifically for the Dissent platform.
• Trigger breaks at a light, repeatable 4-pound pull weight.
• Classified as an AR-platform pistol running a semi-automatic action.

Frequently Asked Questions

What makes the Compact Action different from a standard AR? It houses the entire action and recoil system in the upper receiver, eliminating the buffer tube for a shorter overall package.

Is the safety ambidextrous? Yes, the manual safety runs on both sides for left- and right-handed shooters.

What magazine capacity does it ship with? A 30-round magazine.

Buy the CMMG Dissent Mk4 5.56 NATO Pistol

The buffer-free Compact Action is what sets the Dissent apart from a typical AR pistol, giving shooters full AR-15 capability in a genuinely shorter package. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.