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

The CMMG Dissent Mk4 (CMMG part no. 30AC50F-AB) is an AR personal-defense weapon like no other, chambered in .300 Blackout and built around CMMG’s patent-pending Compact Action, which houses the entire recoil system in the upper receiver and eliminates the buffer tube entirely. A 10.5-inch black nitride threaded barrel gives this configuration more reach than the shorter Dissent variants while staying genuinely compact. AR15 ambidextrous controls and a forward non-reciprocating side charger, switchable for left- or right-handed operation, keep the manual of arms familiar. A rear Picatinny rail section accepts the brace that fits your build. Finished in black armor Cerakote by CMMG, this Dissent is available in a range of custom Cerakote finishes to match your style.

Key Specifications

• Chambered in .300 AAC Blackout, packing full .30-caliber power into a compact case.
• Holds 30+1 rounds per magazine using standard 300 Blackout PMAGs.
• Runs a 10.5-inch black nitride threaded barrel for added reach over shorter Dissent configurations.
• Built around CMMG’s patent-pending Compact Action, which eliminates the buffer tube entirely.
• Wears a 5.5-inch M-LOK handguard for a clean, modular accessory-mounting surface.
• Features CMMG’s Zeroed 60/90-degree safety for a shorter, faster selector throw.
• Includes a CMMG Zeroed pistol grip for a consistent, purpose-built hand fit.
• Ships optics-ready with no fixed sights, leaving the top rail open for a red dot.
• Cycles in reliable semi-auto for controlled, repeatable follow-up shots.
• Finished in black armor Cerakote over an aluminum Picatinny rail receiver.

Frequently Asked Questions

What makes the Dissent different from a standard AR pistol? Its Compact Action houses the entire recoil system in the upper receiver, eliminating the buffer tube for a much shorter overall length.

What caliber does this Dissent fire? .300 AAC Blackout, delivering full .30-caliber power in a compact case.

Is the barrel threaded? Yes, the 10.5-inch black nitride barrel ships threaded for muzzle devices.

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

This 10.5-inch .300 Blackout Dissent gives shooters extra reach from the cartridge while keeping the buffer-tube-free design that makes the platform so compact and modular. Order it from our AR pistols lineup at our Lubbock, Texas gun shop for fast, insured shipping to your FFL.