CMMG Dissent BR4 — 5.56 NATO, 16.1″ Barrel

About this product

The CMMG Dissent BR4 is a purpose-built, semi-automatic modern sporting carbine chambered in .223 Remington/5.56 NATO with a 16.1-inch threaded barrel, designed for shooters who demand mechanical tunability and regulatory simplicity. It utilizes CMMG’s unique Direct Impingement Compact Action and features a billet lower receiver, an adjustable gas system, and a factory-installed ZEROED trigger. This configuration, with its 16.1-inch barrel and SGA stock, places it solidly in the Title I firearm category, avoiding the paperwork and wait times associated with SBR registration under the NFA.

Unlike many competing AR-platform rifles, the Dissent BR4 is engineered from the ground up to balance performance with a straightforward legal status. With a complete, compliant rifle arriving at your FFL, you can focus on tuning the adjustable gas block for your chosen ammunition or suppressor rather than navigating ATF Form 1 requirements. Its out-of-the-box features, including ambidextrous controls and a reversible side-charging handle, make it an immediately capable platform for both recreational and practical use.

What is the CMMG Dissent BR4 used for?

The CMMG Dissent BR4 is built for shooters seeking a highly tunable, reliable, and legally compliant carbine for dynamic range training, 3-gun competition, or as a prepared general-purpose rifle. Its adjustable gas system allows precise cycling tuning from suppressed to unsuppressed fire or for different ammo loads, while the 16.1-inch barrel provides a full-length gas system for reliability without stepping into NFA territory. The reversible side-charging upper offers a distinct ergonomic advantage for malfunction clearing and for shooters who prefer an AR-180 style operation, making it well-suited for timed drills and classes where manual manipulation speed matters.

How does the CMMG Dissent BR4 compare to the Stevens 334 Rifle in .308 Win?

The CMMG Dissent BR4 is a semi-automatic, intermediate-caliber carbine designed for rapid, follow-up shots and modular accessory mounting, whereas the Stevens 334 in .308 Win is a bolt-action firearm built for precision and hunting at longer distances. The Dissent, firing the 5.56mm round, offers a 30-round magazine capacity and faster practical rate of fire, making it superior for defensive scenarios or multi-target engagements. The Stevens 334, with its 20-inch barrel and .308 Winchester chambering, is clearly better for delivering precise, powerful single shots on game at ranges beyond 300 yards, where the 5.56mm cartridge begins to lose significant energy.

What does it weigh and what are the dimensions?

Unloaded and without optics, the Dissent BR4 weighs approximately 6.8 pounds (3.1 kg), with an overall length of 35.5 inches (90.2 cm) with the Magpul SGA stock fully extended. The 16.1-inch barrel contributes to this manageable weight and length, striking a balance between ballistic performance and maneuverability, especially in vehicles or tight spaces. The upper and lower receivers are machined from 7075 T6 aluminum, which adds to the structural rigidity and durability but keeps weight lower than a comparable steel-receiver platform like some legacy battle rifles.

Who is this NOT for?

This rifle is not for the first-time buyer on a strict budget or someone seeking a traditional, rear-charging AR-15 experience without modification. At a price point near $1,950, it commands a significant premium over entry-level AR-15s like the base-model offerings from many manufacturers, which often start below $700. Additionally, the unique side-charging, non-reciprocating handle and its proprietary bolt carrier group mean it is not directly compatible with standard AR-15 parts kits, requiring specific CMMG components for repairs or swaps, which can increase long-term ownership costs and limit aftermarket tinkering.

What's in the box?

The rifle ships from CMMG with two 30-round Magpul PMAG Gen M3 magazines, the CMMG ZEROED muzzle brake installed, and the user manual covering operation and maintenance of the Dissent platform. Notably, it does not include iron sights, a sling, or a cleaning kit, which represent an immediate additional investment of roughly $150-$300 for a basic usable setup. The inclusion of two magazines is standard but appreciated, as it allows immediate function testing and training without an additional purchase, unlike some competitors that ship with only one or sometimes none.

Is the CMMG Dissent BR4 worth it at $1943.99?

At this price, the Dissent BR4 is worth the investment for the shooter who specifically values the integrated side-charging system, the excellent out-of-the-box trigger, and the desire for a compliant 16-inch rifle that feels distinct from a mil-spec AR-15. You are paying for a complete, tuned system with premium features like the billet lower, adjustable gas block, and Cerakote finish that would cost significantly more to assemble piecemeal. However, for a shooter who simply wants a reliable 5.56mm carbine and does not care about the side-charger or trigger, a more conventional and less expensive option like many standard AR-15 models or even a different Stevens rifle for hunting, such as the Stevens 334 in .308, may represent a better value for their specific use case.