Note: this DISSENT (brand part no. 30A2D0FAB) is a pistol-braced AR platform, not a rifle, despite its listing here alongside our semi-auto rifles. The CMMG DISSENT Mk4 pistol is chambered in .300 Blackout and built on the same Compact Action platform as CMMG’s SBR-configured DISSENT rifles, using an arm brace instead of a shoulder stock so it can be sold and shipped without NFA registration. Its patent-pending Compact Action houses the entire recoil system inside the upper receiver, eliminating the buffer tube and letting the 6.5-inch barrel deliver .30-caliber power in an ultra-compact package. It’s built for shooters who want DISSENT-level portability without the NFA paperwork.

Key Specifications

• Configured as a pistol with an arm brace, not a shoulder-stocked rifle, keeping it outside NFA short-barrel regulation.
• Chambered in .300 Blackout, running on CMMG’s patent-pending Compact Action direct impingement system.
• Built around a 6.5-inch barrel that delivers .30-caliber performance in a compact footprint.
• Uses 7075-T6 aluminum upper and Mk4 forged lower receivers shared across the DISSENT line.
• Equipped with an adjustable gas block to tune between supersonic and subsonic .300 Blackout loads.
• Feeds from a 30-round magazine for extended capacity.
• Finished in Armor Black Cerakote for a durable, low-visibility look.

Frequently Asked Questions

Is this DISSENT an NFA item? No. It ships configured as a pistol with an arm brace rather than a shoulder stock, which keeps it outside NFA short-barreled-rifle rules despite the 6.5-inch barrel.

What is CMMG’s Compact Action? It houses the entire recoil system inside the upper receiver instead of a traditional buffer tube, which is what makes this pistol’s compact size possible.

Can the gas system be tuned for suppressed shooting? Yes, the adjustable gas block lets you dial in the system for supersonic or subsonic .300 Blackout ammunition.

Buy the CMMG DISSENT Mk4 Pistol

Order the CMMG DISSENT Mk4 pistol in .300 Blackout from our Lubbock, Texas gun shop for fast, insured shipping to your local FFL, no tax stamp required. CMMG built the DISSENT to be the most compact way to run a .300 Blackout platform, and it’s a notable entry among our full semi-auto rifles selection.