CMMG 28B940CAB Dissent 22ARC 16.10″ Upper Review

First Thoughts on the CMMG 28B940CAB Dissent 22ARC 16.10″ Upper

The CMMG 28B940CAB Dissent 22ARC 16.10″ Upper represents a significant leap in the AR-15 platform’s adaptability. CMMG has carved a niche for themselves with innovative designs, and the Dissent upper is no exception, promising a unique blend of compact design and reliable performance in the newly introduced .22 ARC caliber. I’ve been anticipating the arrival of the Dissent platform in other calibers besides 5.56, and the .22 ARC piqued my interest immediately.

My experience lies in evaluating equipment that balances portability and power. This upper receiver seemed tailor-made for suppressed shooting and varmint hunting at longer ranges. I was particularly interested in how well the .22 ARC would perform from a relatively short barrel, and how the recoil impulse would feel.

Upon unboxing, the CMMG Dissent immediately impressed me with its clean lines and robust construction. The absence of a traditional buffer tube is striking, immediately signaling a departure from standard AR-15 configurations. The unit felt solid, with no noticeable play or looseness in any of the components. The weight was surprisingly manageable, which is vital for any platform meant for long-range shooting or extended carry.

I initially considered the BRN-180 upper as a comparable alternative, but ultimately chose the CMMG Dissent due to the anticipated benefits of the .22 ARC round, and the compact nature of the system. I have also considered building a dedicated .22 ARC AR-15, but the Dissent allows me to utilize my existing lowers. My first impression was excitement mixed with cautious optimism, eager to see if it lives up to the hype and justifies its price tag of $1,326.99.

Real-World Testing: Putting CMMG 28B940CAB Dissent 22ARC 16.10″ Upper to the Test

First Use Experience

My initial test took place at an outdoor shooting range, primarily focusing on accuracy and reliability at 100 yards. The CMMG Dissent was mounted on a standard AR-15 lower receiver with a Geissele SSA-E trigger. The conditions were clear and sunny, with a slight breeze.

Right out of the gate, the CMMG Dissent proved to be exceptionally smooth cycling. The absence of the buffer tube resulted in a very mild recoil impulse. The action felt incredibly consistent with a quality suppressor attached. My initial zeroing was quick and straightforward, and within a few shots, I was consistently hitting a 1-inch target at 100 yards. There were no malfunctions experienced within the first 100 rounds.

Extended Use & Reliability

After several months of consistent use, the CMMG Dissent continues to perform reliably. I’ve put roughly 500 rounds through it at this point. I have used it in various conditions, including dusty environments and temperatures ranging from 40 to 90 degrees Fahrenheit.

Durability has been exceptional, with no noticeable wear and tear beyond minor cosmetic scuffs. Maintenance is straightforward, requiring a simple cleaning and lubrication after each range session. The compact design makes it incredibly easy to disassemble and clean. I have found the CMMG Dissent to be much more impressive than my experience with some other AR-15 uppers regarding the ease of maintenance.

Breaking Down the Features of CMMG 28B940CAB Dissent 22ARC 16.10″ Upper

Specifications

• Caliber: .22 ARC. This is the defining characteristic, offering a flat-shooting, low-recoil option for varmint hunting and target shooting.
• Barrel Length: 16.10″. The barrel length is a good compromise between maneuverability and maximizing the .22 ARC’s ballistic potential.
• Operating System: Compact Action. This unique design eliminates the need for a buffer tube.
• Muzzle Device: Threaded Muzzle. This feature allows for easy attachment of suppressors and other muzzle devices.
• Weight: Approximately 4.6 lbs (estimated). This makes it a relatively lightweight option for carrying in the field.
• Upper Receiver Material: 7075-T6 Aluminum. This ensures exceptional strength and durability.

These specifications translate to a highly functional and versatile upper receiver group. The combination of the .22 ARC cartridge and the compact action system creates a unique shooting experience. The CMMG Dissent offers the familiar ergonomics of the AR-15 platform but with a reduced recoil impulse and a more compact overall package.

Performance & Functionality

The CMMG Dissent performs exceptionally well in its intended role. Its accuracy is impressive, especially when paired with a quality optic. Reliability has been consistent across various ammunition types, with minimal malfunctions.

The main strengths are its smooth operation, low recoil, and compact design. The primary weakness is the cost of .22 ARC ammunition, which can be more expensive and harder to find compared to common cartridges like 5.56 NATO. The CMMG Dissent easily meets and exceeds expectations for a compact, accurate, and reliable AR-15 upper.

Design & Ergonomics

The CMMG Dissent boasts a well-thought-out design. The absence of the buffer tube significantly reduces the overall length, making it ideal for compact builds and storage. The materials used are of high quality, and the fit and finish are excellent.

The Dissent upper offers familiar AR-15 ergonomics, with the standard controls being easily accessible. The absence of the buffer tube can take some getting used to, especially if you are accustomed to the traditional AR-15 balance and feel. The design feels immediately intuitive.

Durability & Maintenance

The CMMG Dissent’s durable construction suggests a long service life. The 7075-T6 aluminum upper receiver and quality components contribute to its overall robustness.

Maintenance is simple and straightforward. The Dissent upper can be easily disassembled for cleaning and lubrication. The CMMG Dissent is designed for long-term reliability with minimal hassle.

Accessories and Customization Options

The CMMG Dissent is compatible with a wide range of AR-15 accessories. This includes standard AR-15 handguards, optics, and triggers. The threaded muzzle allows for the use of suppressors and other muzzle devices.

While the Dissent utilizes a unique action, it maintains compatibility with standard AR-15 lower receivers. This allows for a wide range of customization options. The CMMG Dissent is a highly adaptable platform for building a custom AR-15.

Pros and Cons of CMMG 28B940CAB Dissent 22ARC 16.10″ Upper

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Who Should Buy CMMG 28B940CAB Dissent 22ARC 16.10″ Upper?

The CMMG 28B940CAB Dissent 22ARC 16.10″ Upper is perfect for: Varmint hunters seeking a flat-shooting, low-recoil option, especially when suppressed. Target shooters looking for a unique and accurate AR-15 platform. Those who value a compact and easily transportable firearm.

This product might not be ideal for: Shooters on a tight budget. Individuals who prioritize readily available and inexpensive ammunition.

Must-have accessories include: A high-quality optic for maximizing accuracy, a suppressor for reduced noise and recoil, and a reliable supply of .22 ARC ammunition.

Conclusion on CMMG 28B940CAB Dissent 22ARC 16.10″ Upper

The CMMG 28B940CAB Dissent 22ARC 16.10″ Upper is an exceptional product that delivers on its promises of accuracy, reliability, and compact design. The innovative buffer-less design, combined with the flat-shooting .22 ARC cartridge, creates a unique shooting experience.

While the price point is higher than a standard AR-15 upper, the performance and features justify the cost for those seeking a high-quality, purpose-built platform. I would highly recommend the CMMG Dissent to anyone looking for a compact, accurate, and reliable AR-15 upper for varmint hunting, target shooting, or suppressed applications. Consider adding the CMMG Dissent to your collection; you won’t be disappointed!

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