CMMG 28B940CAB Dissent 22ARC 16.10″ Upper Review

The CMMG 28B940CAB Dissent 22ARC 16.10″ Upper Made a Bold First Impression

The CMMG 28B940CAB Dissent 22ARC 16.10″ Upper isn’t just another AR upper; it’s a statement. CMMG dared to deviate from the norm, crafting a side-charging, buffer-less system chambered in the promising 22 ARC. This upper promises to deliver AR-15 accuracy and modularity to the 22 ARC cartridge, making it a potentially game-changing upgrade for AR enthusiasts.

I was looking for a lighter recoiling option for longer range target practice that wouldn’t break the bank compared to my centerfire rifles. I also wanted to explore the capabilities of the 22 ARC.

Unboxing the CMMG Dissent Upper was a surprisingly premium experience. The finish was immaculate, the side-charging handle felt incredibly solid, and the overall build quality screamed attention to detail. It was immediately apparent that this wasn’t some slapped-together afterthought, but a well-engineered piece of hardware.

Compared to traditional AR uppers from brands like Bravo Company Manufacturing (BCM) and Daniel Defense, the CMMG Dissent stands out due to its side-charging mechanism and buffer-less design. I picked it specifically for these features, prioritizing a more compact and potentially more reliable system over the conventional buffer tube setup.

My first impression was definitely excitement mixed with a healthy dose of curiosity. I was eager to see if its performance lived up to its innovative design. At $1,326.99, it’s not an impulse buy, so it needed to deliver.

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

First Use Experience

My first range session with the CMMG Dissent Upper was at an outdoor range with distances out to 300 yards. The weather was pleasant, with a slight breeze, providing ideal conditions for testing its accuracy. I mated it with a standard AR-15 lower and used a variety of 22 ARC ammunition to gauge its performance across different bullet weights and velocities.

The CMMG Dissent performed admirably, even with cheaper bulk ammo. The side-charging handle was intuitive and easy to manipulate. After a few magazines, I was comfortable and confident with the new system. I encountered no malfunctions in the first 200 rounds, even with a mix of ammunition types.

This upper was very easy to use with very little to no learning curve. The side charging handle is much more ergonomic and easy to actuate than the standard AR charging handle.

Extended Use & Reliability

After several weeks of consistent use, the CMMG Dissent Upper continues to impress. It’s seen over 1000 rounds now and hasn’t experienced a single failure to feed or extract. The upper is holding up nicely.

The CMMG Dissent has proven to be remarkably durable. There are no noticeable signs of wear and tear on the receiver or the charging handle assembly. Cleaning is straightforward, requiring only basic AR cleaning tools and solvents.

Compared to my experience with a traditional direct impingement AR upper, the CMMG Dissent‘s buffer-less system seems to run cleaner. This means less carbon buildup in the action. It definitely outperforms other rimfire conversion kits I’ve used.

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

Specifications

The CMMG 28B940CAB Dissent 22ARC 16.10″ Upper is meticulously designed for optimal performance. The upper receiver is machined from high-quality aluminum, offering a balance of strength and weight. The 22 ARC caliber provides a flat shooting and accurate experience.

• Caliber: 22 ARC. The 22 ARC is designed to be a long range .22 caliber round.
• Barrel Length: 16.10 inches. This barrel length is optimal for velocity and maneuverability.
• Weight: The Dissent Upper is designed to be lightweight, although no official weight is provided. The overall reduction in bulk over a standard AR upper receiver is significant.
• Operating System: Direct Blowback. This system is simple and reliable.
• Charging Handle: Non-Reciprocating Side Charging Handle. This allows for easier manipulation and keeps the shooter on target.

These specifications are carefully considered to maximize the performance of the 22 ARC cartridge within the AR platform. The direct blowback system ensures reliability, while the side charging handle enhances ergonomics.

Performance & Functionality

The CMMG 28B940CAB Dissent 22ARC 16.10″ Upper excels in accuracy and reliability. It consistently delivers tight groups at 100 yards with match-grade ammunition. The non-reciprocating side charging handle is a significant upgrade over the traditional AR charging handle, allowing for faster follow-up shots and better control.

One minor weakness is the lack of a last-round bolt hold open, which is present on some AR-15 uppers. This can be mitigated by paying attention to round count and visual confirmation. The CMMG Dissent exceeds expectations.

Design & Ergonomics

The CMMG Dissent Upper features a sleek, modern design. The aluminum receiver is lightweight and durable. The ergonomics are excellent, with the side charging handle positioned for easy access and manipulation.

The design is intuitive and user-friendly. The learning curve is minimal, even for those accustomed to traditional AR uppers. The CMMG Dissent feels well-balanced and comfortable.

Durability & Maintenance

The CMMG Dissent Upper is built to last. The high-quality materials and robust construction ensure longevity. Maintenance is straightforward, requiring only basic cleaning after each range session.

Spare parts are readily available from CMMG and other aftermarket suppliers. With proper care, the CMMG Dissent Upper should provide years of reliable service.

Accessories and Customization Options

The CMMG Dissent Upper is compatible with a wide range of AR-15 accessories. This includes aftermarket handguards, optics, and muzzle devices. It readily accepts standard AR-15 lowers.

The modular design of the CMMG Dissent allows for easy customization. This gives users the ability to tailor it to their specific needs and preferences. Be sure to choose a lower receiver designed for pistol caliber carbines.

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