CMMG Dissent Mk4 Pistol 5.56x45mm 6.50in 30+1

About this product

The CMMG Dissent Mk4 is a compact, buffer-less AR-style pistol chambered for 5.56x45mm NATO that eliminates the traditional buffer system and shortens the platform for a 14.7-inch overall length. It employs CMMG's patent-pending Compact Action, utilizing a radial-delayed blowback mechanism derived from their Banshee series, but reconfigured for 5.56 pressures in a 4.6-pound package. This design represents a significant mechanical departure from standard direct-impingement ARs, fundamentally changing the recoil impulse and manual of arms for shooters accustomed to traditional buffer tubes.

What is the CMMG Dissent Mk4 used for?

The Dissent Mk4 is engineered primarily for close-quarters personal defense and as a compact, vehicle-compatible utility weapon. Its 6.5-inch free-floated barrel and 14.7-inch collapsed length make it highly stowable, while the 5.56x45mm chambering provides terminal performance superior to pistol cartridges within its effective 100-yard range. The buffer-less action allows for immediate deployment from tight spaces like a vehicle cabin without snagging on a tube, and the ambidextrous controls accommodate dynamic, close-quarters manipulation under stress.

How does the CMMG Dissent Mk4 compare to a Daniel Defense MK18 pistol?

The CMMG Dissent Mk4 is fundamentally mechanically different and shorter than a Daniel Defense MK18, which uses a traditional gas-operated, buffer-tube system. A standard MK18 pistol with a 10.3-inch barrel measures approximately 26.5 inches overall and weighs about 6.25 pounds, making the Dissent over 11 inches shorter collapsed and 1.65 pounds lighter. The MK18's direct-impingement system offers more proven long-term reliability with a wider variety of ammunition, while the Dissent's radial-delayed blowback provides a distinctly softer, slower recoil impulse that is better for rapid follow-up shots in its intended close-range role.

What does it weigh and what are the dimensions?

The Dissent Mk4 weighs 4.6 pounds (74.4 ounces) unloaded and measures 14.7 inches from the end of the 6.5-inch barrel to the back of the receiver, not including any brace or stock. With a standard 30-round PMAG inserted, the weight increases to approximately 5.1 pounds, and the width across the handguard is 1.75 inches. Its collapsed profile is roughly 40% shorter than a Stevens 334 bolt-action rifle, making it a genuinely packable firearm, though the short barrel means significant muzzle blast and flash.

Who is this NOT for?

This pistol is not for new shooters seeking a first AR platform, nor is it for anyone prioritizing long-range accuracy or standardized parts compatibility. The proprietary bolt carrier group and radial-delayed system lock you into CMMG for specific internal parts, unlike the near-universal compatibility of a mil-spec AR-15. It's also a poor choice for hunters or those needing to engage targets past 150 yards with consistency, as the 6.5-inch barrel severely compromises 5.56 muzzle velocity, dropping a standard 55-grain round to roughly 2,200 feet per second.

What's in the box?

You receive the complete Dissent Mk4 pistol, one 30-round Magpul PMAG, a Picatinny rail section for attaching a front iron sight or other accessory, and all necessary owner's manuals and compliance paperwork. CMMG does not include an optic, brace, or sling, as these are considered personal preference items and are often subject to shifting ATF rulings. The pistol ships in a standard cardboard box with foam padding; purchasing a quality hard case, like a Pelican 1700, is a necessary additional expense for serious transport.

Is the CMMG Dissent Mk4 worth it at $1,798.99?

At $1,798.99, the Dissent Mk4 commands a premium for its innovative, proprietary technology and compact form factor, costing approximately $600 more than a basic AR pistol build from PSA. It's worth the price if your specific need is the absolute shortest possible 5.56 platform with a radically different recoil management system, and you accept the trade-offs in parts commonality and long-range ballistics. If your use case is broader or you value aftermarket customization and training commonality with standard ARs, a more traditional Stevens 555 shotgun for home defense or a conventional AR pistol will provide better value.