Cmmg Dissent Mk4 Pistol 300Blk 6.5 Armor Blk Br

The CMMG Dissent Mk4 pistol in 300 Blackout is a radical rethink of the AR-platform personal defense weapon. Built around CMMG's patent-pending Compact Action, this 300 Blk uses a direct-impingement system housed entirely in the upper receiver—eliminating the traditional buffer tube that takes up real estate you don't have in a compact package. The result is a 15.7-inch overall length firearm that hits hard with .30 caliber power without sacrificing the controls and modularity shooters expect from modern AR pistols.

If you've run AR pistols before, the Dissent Mk4 300 Blackout feels familiar where it counts. You get full ambidextrous controls, a non-reciprocating side charger (switchable for lefty or righty operation), and a 1913 Picatinny rail at the rear receiver for mounting a brace or stock of your choice. The 6.5-inch barrel wears a 1:7 twist and a CMMG ZEROED linear compensator (5/8x24 threads), and the gas block is adjustable for tuning reliability with various ammunition loads. At 4.8 pounds, it's genuinely compact without feeling skeletal.

Build quality reflects CMMG's attention to detail. Both upper and lower receivers are forged 7075 T6 aluminum, the handguard is CMMG's proprietary design, and the trigger is a CMMG ZEROED drop-in single-stage. Everything wears a professional Armor Black Cerakote finish. The package ships with a 30-round Magpul PMAG sized for 300 BLK, a CMMG ZEROED pistol grip, trigger guard, and 60/90-degree safety selector. This is a no-compromise compact platform for shooters serious about 300 Blackout in the tightest spaces.

Key Features

• Patent-pending Compact Action eliminates buffer tube for ultra-compact profile
• 300 Blackout chambering delivers .30 caliber performance in tight quarters
• Full ambidextrous AR-15 controls and non-reciprocating side charger
• Switchable left/right-hand charging handle operation
• 1913 Picatinny rail for brace or stock attachment of your choice
• Adjustable gas block for ammunition tuning
• Forged 7075 T6 aluminum receivers for durability
• CMMG ZEROED matched components throughout
• Includes 30-round Magpul 300 BLK magazine

Specifications

Frequently Asked Questions

What makes the Compact Action different from a standard AR-15 pistol?

The Compact Action houses the entire recoil system in the upper receiver, eliminating the traditional buffer tube. This design makes the Dissent substantially more compact while maintaining the core AR ergonomics and controls shooters know.

Can I switch the charging handle to right-hand operation?

Yes. The Dissent features a non-reciprocating side charger that can be switched between left and right-hand operation depending on your preference.

What brace or stock can I attach to this pistol?

The rear of the lower receiver features a 1913 Picatinny rail section, allowing you to attach any compatible brace or stock of your choice.

What comes in the box?

The Dissent Mk4 ships with a 30-round Magpul 300 BLK magazine and all the CMMG ZEROED components installed (pistol grip, trigger guard, safety selector, and trigger).