CMMG Dissent MK4 5.7×28 6.5″ 32+1 Black

Description

The CMMG Dissent MK4 5.7×28 6.5″ 32+1 Black is a compact, buffer-less AR pistol built around CMMG’s patent-pending Compact Action. Chambered in 5.7x28mm, it pairs a short 6.50″ free-floated barrel with a 5.5″ M-LOK handguard for a minimal footprint and modular accessory mounting. Finished in black Cerakote and equipped with an optic-ready top rail and ambidextrous safety, the Dissent is designed for stowability and straightforward handling. The pistol ships with two magazines and a zeroed drop-in single-stage trigger for immediate range use.

Manufacturer	CMMG (per manufacturer specs)
Model	Dissent MK4
Material	7075-T6 aluminum upper and lower receiver, 4140 steel barrel
Compatibility	5.7×28 ammunition; accepts CMMG-specific magazines
Finish	Black Cerakote
Weight	4 lb 12 oz (unloaded, per manufacturer specs)
Condition	New

Key Features

• Compact Action — eliminates the buffer tube to shrink overall length by nearly 4 inches versus a standard AR pistol, making it easier to stow in a bag or vehicle.
• 6.50″ Chrome-Lined Barrel — delivers consistent accuracy and long service life with the high-velocity 5.7×28 round, while keeping the package compact.
• 5.5″ M-LOK Handguard — provides a slim, lightweight platform for attaching lights, lasers, or grips without adding bulk.
• Ambidextrous Safety Selector — allows intuitive manipulation for left- or right-handed shooters, speeding up operation under stress.
• Drop-In Single-Stage Trigger — factory zeroed for a crisp break, so you can start shooting accurately right out of the box.

Who It’s For

The Dissent MK4 is built for shooters who want a compact, packable AR pistol that still handles like a full-size rifle. It’s ideal for truck or backpack carry, home defense, or as a secondary option for range sessions where weight and length matter. Traditional shooters who appreciate a solid aluminum receiver set and a clean trigger will feel at home with this design.

Pros & Cons

• Pros: Buffer-less design saves space; accurate chrome-lined barrel; ambi controls; Cerakote finish resists wear; 32+1 capacity with factory magazines.
• Cons: The short 5.5″ handguard limits rail space for accessories; aftermarket support for the Compact Action is still growing, so replacement parts are less common than for standard ARs.

Comparison vs. Competitors

Feature	CMMG Dissent MK4 5.7×28	Zev Technologies OZ9C	Geissele Super Duty Pistol
Caliber	5.7×28	9mm	5.56 NATO
Action Type	Buffer-less direct impingement	Striker-fired (pistol frame)	Standard direct impingement with buffer tube
Barrel Length	6.50″	4.5″	10.3″
Capacity	32+1	15+1	30+1
Weight	4 lb 12 oz	1 lb 12 oz	6 lb 2 oz
Price	$1,778.59	$1,999.99	$1,899.99

FAQ

Does the CMMG Dissent MK4 work with standard AR-15 magazines?

No. The Dissent uses CMMG-specific magazines designed for the 5.7×28 cartridge. Two are included with the pistol, and additional CMMG mags are available separately.

Can I mount a suppressor on the 6.50″ barrel?

Yes, the barrel is threaded 1/2×28, so it accepts standard 5.56/5.7 suppressors. Note that the handguard is only 5.5″ long, so the barrel extends past it, giving you room for a direct-thread or QD mount.

Is the Dissent MK4 legal to own in all states?

It ships as a pistol with a brace-compatible receiver extension (no stock). Check your local laws regarding barrel length and overall length restrictions. In most states, it’s classified as a pistol and requires a standard handgun purchase procedure.

How does the Compact Action affect reliability?

According to CMMG, the Compact Action uses a captured recoil spring system that cycles smoothly with 5.7×28 ammunition. Early reviews from owners report reliable feeding with quality ammo, but like any new platform, a break-in period of 100-200 rounds is recommended.

The CMMG Dissent MK4 5.7×28 6.5″ 32+1 Black is a purpose-built compact AR pistol that ditches the buffer tube for better portability. With a 32+1 capacity, Cerakote finish, and a crisp trigger, it’s ready to run from the moment you open the box. Order yours today for fast, secure delivery.

✓ Nationwide delivery (all 50 states)
✓ Ships 1-2 business days
✓ 30-day returns
✓ Secure checkout

Browse related categories: AR Pistols | 5.7×28 Ammunition | AR Uppers

Last updated: April 2026