CMMG Dissent Mk4 Pistol, .300 Blackout, 10.5-Inch, Black

Some cartridges need a longer barrel to reach their full ballistic potential, but not .300 Blackout. The CMMG Dissent Mk4 (CMMG part no. 30AC278AB) runs a 10.5-inch barrel to take full advantage of almost any .300 Blackout loading you can think of, while staying ultra-compact and portable by eliminating the buffer system found on a conventional AR15. A rear 1913 Picatinny rail end plate lets shooters pick the folding brace that suits their needs, and an adjustable gas block lets you fine-tune the system for supersonic or subsonic loads. The TriggerTech AR-D trigger, developed in collaboration with CMMG specifically for Dissent firearms, delivers a light, repeatable 4-pound break. Finished in CMMG‘s black, this Dissent is available in multiple Cerakote finishes to match your style.

Key Specifications

• Chambered in .300 AAC Blackout, an incredibly adaptable cartridge with dedicated loadings for supersonic or subsonic use.
• Runs a 10.5-inch barrel, long enough to take full advantage of nearly any .300 Blackout loading.
• Holds 30 rounds per magazine for a deep reserve of ready ammunition.
• Built around CMMG’s patent-pending Compact Action, which eliminates the buffer tube entirely.
• Features an adjustable gas block for fine-tuning between supersonic and subsonic loads.
• Wears a 9.6-inch M-LOK handguard for a full-length accessory mounting surface.
• Runs the TriggerTech AR-D trigger, delivering a light, repeatable 4-pound break optimized for Dissent firearms.
• Operated through a left-side non-reciprocating charging handle that keeps you on target while cycling.
• Ships optics-ready, leaving the top rail open for the sighting system of your choice.

Frequently Asked Questions

Why does this Dissent run a longer 10.5-inch barrel? .300 Blackout doesn’t need extra length to perform, so the 10.5-inch barrel lets you take full advantage of nearly any loading while staying compact.

Can the gas system be tuned for subsonic ammo? Yes, the adjustable gas block lets you fine-tune between supersonic and subsonic .300 Blackout loads.

What trigger does it use? The TriggerTech AR-D trigger, developed specifically for Dissent firearms with a light, repeatable 4-pound break.

Buy the CMMG Dissent Mk4 Pistol, .300 Blackout, 10.5-Inch, Black

This Dissent proves .300 Blackout doesn’t need a long barrel to perform, all while eliminating the buffer tube for a genuinely compact, portable package. Order it from our AR pistols lineup at our Lubbock, Texas gun shop for fast, insured shipping to your FFL.