CMMG AB .338 ARC: Tactical Power with Bufferless Innovation

When a mission calls for the punch of a large-bore and the ergonomics of an AR-pattern platform, the balance between stopping power, controllability, and modularity becomes the deciding factor. As shooters who value precision and practicality, we look for systems that simplify setup without sacrificing performance under stress.

CMMG DISSENT BR4 [AB]

John Wick and Garand Thumb here — between us, we test gear the hard way: extended drills, varied suppressor setups, and real-world ergonomics. The CMMG DISSENT BR4 [AB] is one of those platforms that deserves a close read for anyone considering serious semi-auto capability in .338 ARC. Below we break down what makes this rifle unique, why the bufferless design matters, and where this build fits on the range and in the field.

What the DISSENT BR4 [AB] Brings to the Table

The DISSENT Br4 utilizes CMMG’s patented bufferless receiver and is designed for use with traditional rifle style stocks. The Dissent uses the company’s patented Compact Action system, allowing for reliable direct impingement operation without the need for a buffer tube assembly. That engineering choice changes how you configure the firearm — it frees up stock options while retaining AR-like handling. For operators who want an AR stance and cheek weld without a rear buffer tube profile, this is a clear advantage.

Bufferless Receiver and Compact Action System

CMMG’s bufferless receiver and Compact Action system eliminate the classic buffer tube requirement by rethinking the action geometry. The takeaway is a platform that keeps the smooth cycling of a direct impingement system but allows for rifle-style stocks and compact setups not otherwise possible on a standard AR. This also simplifies cheek positioning and makes slung carry and vehicle storage more adaptable.

Magpul SGA Stock Inclusion

Unusually, the DISSENT Br4 includes a Magpul SGA stock for 870 shotguns. While normally associated with pump shotgun platforms, its inclusion shows CMMG’s intent to provide a rugged, adjustable interface straight out of the box. The SGA’s adjustable length of pull and solid cheek support give a stable platform for the heavier recoil impulse of .338 ARC, and it arrives ready for immediate use.

Chambered in .338 ARC — Why That Caliber?

New for 2025, CMMG is happy to introduce their tried and true platform in Hornady’s new .338 ARC cartridge. Made to combine the prowess of the AR15 platform with the stopping power of a large bore caliber, .338 ARC strives to emulate the sub or supersonic versatility of the now ubiquitous .300 BLK cartridge with more energy on target and less gas system tuning when switching from suppressed to unsuppressed. In short, .338 ARC gives you greater terminal performance than most intermediate cartridges available in AR-length systems while maintaining manageable recoil in a well-balanced rifle.

Applications and Ballistics Considerations

.338 ARC is suitable for medium-to-large game and precision work at extended ranges within the effective limits of a 16.1-inch barrel. It’s versatile for subsonic and supersonic loads, which makes the cartridge attractive for shooters who rotate between suppressed and unsuppressed configurations. Because it requires less gas-system retuning across suppressor changes compared to some other big-bore AR conversions, it reduces headache during load development and field use.

Barrel, Finish, and Included Gear

This model features a 16.1-inch barrel along with an Armor Black Cerakote finish. The 16.1-inch length hits a balance between velocity and maneuverability, keeping the rifle compact for transport while extracting good performance from .338 ARC loads. The Armor Black Cerakote gives a matte, durable finish that resists corrosion and scuffs in use.

One 10-round magazine is included, providing a ready-to-shoot package. At a price point of $1702.99, the DISSENT Br4 [AB] positions itself as a specialty semi-auto offering: higher than a basic AR-15 but competitive compared to bespoke large-bore builds that require extensive gunsmithing or conversion kits.

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Handling, Recoil Management, and Practical Shooting

With larger calibers, stock geometry and overall balance dictate perceived recoil and shot recovery. The bufferless DISSENT Br4 [AB] design and included Magpul SGA stock help centralize weight and reduce muzzle hop compared to lightweight conversions with ill-fitting furniture. The 16.1-inch barrel and Cerakote finish add durability without excessive front weight, aiding both offhand and supported shooting positions.

Suppressed vs Un‑suppressed Use

The .338 ARC has been tuned to limit the need for gas system adjustments when moving between suppressed and unsuppressed setups. For range-goers who plan to alternate configurations, that means less time dialing gas blocks and more time on the trigger. That predictability is a practical benefit when reliability under varied conditions matters most.

Build Quality, Brand Legacy, and Value

Cmmg is known for innovative engineering and platform-level solutions such as the Compact Action. The DISSENT Br4 [AB] builds on that reputation by integrating a bufferless receiver into a complete semi-auto package chambered in an increasingly relevant big-bore cartridge. At $1702.99 for a ready gun with a 16.1-inch barrel, Cerakote finish, Magpul SGA stock, and one 10-round magazine, it represents a targeted value for shooters who want factory-level refinement rather than piecing together a conversion.

For buyers ready to evaluate fit and handling in person, View product details and pricing on the shop page to check specs, photos, and availability.

For shooters who appreciate engineering that solves real ergonomic problems, the DISSENT Br4 stands out. Whether your priority is large-bore stopping power, a stable rifle-style stock without a buffer tube, or an out-of-the-box package ready for load development, this model is a focused option. Check current availability and secure yours through the shop page — this link goes directly to the product listing where you can initiate the purchase process.

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People Also Ask

What makes this product stand out from competitors?

This product offers superior quality and innovative features that set it apart in the market. Its design focuses on both performance and reliability, making it a top choice for professionals and enthusiasts alike.

Is this product suitable for beginners?

Yes, this product is designed with user-friendly features that make it accessible to beginners while still offering advanced capabilities for experienced users.

What warranty or support is available?

The product comes with comprehensive warranty coverage and excellent customer support to ensure your satisfaction and peace of mind.

How does this compare to similar products in its price range?

This product offers exceptional value for its price point, providing features and quality that typically cost significantly more in comparable alternatives.

What maintenance is required?

Minimal maintenance is required thanks to the product’s durable construction and quality materials. Regular cleaning and occasional inspections will keep it performing optimally.