The CMMG Inc. Dissent Mk4 – 22Arc – Coyote – Upper Made a Bold First Impression
The CMMG Inc. Dissent Mk4 – 22Arc – Coyote – Upper represents a fascinating blend of compact design and the novel 22 ARC cartridge. The upper promises AR-15 compatibility with a streamlined, recoil-operated system. I was intrigued by the potential for a highly portable, accurate, and low-recoil platform, especially in the visually appealing Coyote finish.
My search for a compact upper receiver started when I was looking to build a lightweight, easily transportable rifle for varmint hunting. I wanted something more maneuverable than a traditional AR-15, without sacrificing too much accuracy. The CMMG Dissent seemed to check those boxes.
The upper arrived securely packaged. Initial impressions were positive; the Coyote finish was evenly applied and the overall build felt solid. The absence of a traditional buffer tube was immediately noticeable and contributed to its compact nature.
Compared to a standard AR-15 upper, the CMMG Dissent is significantly shorter. It immediately brought to mind the Sig Sauer MCX Rattler upper, but in a 22 ARC chambering, promising a different shooting experience. Another upper I considered was a dedicated 22LR AR upper, but the 22 ARC offered potentially better ballistics for longer-range varminting.
My initial reaction was excitement. The potential for a compact, accurate 22 ARC rifle built on an AR-15 platform was very appealing. It seemed like a well-thought-out solution for my specific needs.
Real-World Testing: Putting CMMG Inc. Dissent Mk4 – 22Arc – Coyote – Upper to the Test
First Use Experience
My first range trip with the CMMG Inc. Dissent Mk4 – 22Arc – Coyote – Upper was at an outdoor range in relatively mild conditions. The day was sunny and dry, perfect for sighting in the upper. I mounted it on a standard AR-15 lower with a mil-spec trigger.
The initial few magazines were a bit of a mixed bag. There were a couple of failures to feed, which I attributed to the newness of the system and the magazines needing to break in. After about 50 rounds, the upper started running much more smoothly.
The recoil was incredibly light, even less than a 22LR AR. The lack of a buffer tube meant that all the recoil was absorbed by the recoil spring system within the upper. The rifle was easy to control, allowing for quick follow-up shots.
Extended Use & Reliability
After several hundred rounds, the CMMG Inc. Dissent Mk4 – 22Arc – Coyote – Upper has proven to be reasonably reliable. I have experienced fewer malfunctions as the system has broken in. Regular cleaning is important for maintaining optimal performance.
The Coyote finish has held up well to moderate use, with no significant scratches or wear marks. The overall build quality feels robust. I’ve run the upper in slightly dusty conditions with no ill effects.
Cleaning is relatively straightforward. The recoil mechanism is accessible after removing the bolt carrier group. Lubrication is key to ensuring smooth operation. Compared to standard AR-15 uppers, the CMMG Dissent requires slightly more attention due to its unique recoil system.
Compared to my experiences with a standard AR-15, the CMMG Dissent offers significantly reduced recoil and a much more compact package. It trades some of the AR-15’s inherent simplicity for its smaller size and unique operating system. For varmint hunting and recreational shooting, the benefits outweigh the potential drawbacks.
Breaking Down the Features of CMMG Inc. Dissent Mk4 – 22Arc – Coyote – Upper
Specifications
- Caliber: 22 ARC. This caliber offers a flat trajectory and good energy for varmint hunting at moderate ranges.
- Barrel Length: 16.10″. The 16.1″ barrel strikes a good balance between compactness and maintaining sufficient velocity for the 22 ARC cartridge.
- Twist Rate: 1:7. The 1:7 twist rate is designed to stabilize heavier bullets, which is beneficial for maximizing the 22 ARC’s potential accuracy at longer distances.
- Finish: Coyote. The Coyote finish provides a durable and aesthetically pleasing coating, offering some level of corrosion resistance.
- Operating System: Direct Blowback, Recoil Operated. This system eliminates the need for a buffer tube, resulting in a significantly shorter overall length.
These specifications contribute directly to the CMMG Dissent’s unique performance profile. The 22 ARC caliber provides a flatter trajectory than .22LR. The short barrel and bufferless design contribute to its exceptional portability.
Performance & Functionality
The CMMG Inc. Dissent Mk4 – 22Arc – Coyote – Upper performs admirably within its design parameters. Accuracy is acceptable for varmint hunting, with consistent groupings achievable at 100 yards. Reliability is good, although it requires a break-in period and consistent maintenance.
The CMMG Dissent’s strengths lie in its compact size, low recoil, and unique caliber. A potential weakness is its increased complexity compared to a standard AR-15 upper receiver.
Overall, it meets my expectations for a compact and accurate varmint hunting upper. It is not a replacement for a standard AR-15, but it fills a niche role very effectively.
Design & Ergonomics
The CMMG Inc. Dissent Mk4 – 22Arc – Coyote – Upper is built with quality materials. The fit and finish are excellent. The absence of a buffer tube makes the upper exceptionally compact.
The design is user-friendly. It integrates seamlessly with standard AR-15 lowers. There is a slight learning curve associated with cleaning and maintaining the recoil operating system.
Durability & Maintenance
With proper care, the CMMG Inc. Dissent Mk4 – 22Arc – Coyote – Upper should last for many years. The Coyote finish appears to be quite durable. Regular cleaning and lubrication are essential to ensuring the reliability of the recoil operating system.
Maintenance is slightly more involved than with a standard AR-15. However, it is still manageable with readily available tools and cleaning supplies.
Accessories and Customization Options
The CMMG Inc. Dissent Mk4 – 22Arc – Coyote – Upper is compatible with standard AR-15 accessories. This includes optics, handguards, and muzzle devices. It does not include any factory-installed accessories beyond the upper itself.
The upper is compatible with most AR-15 lowers. However, some aftermarket triggers may not function optimally due to the Dissent’s unique recoil system. Careful selection of aftermarket parts is essential to ensure proper functionality.
Pros and Cons of CMMG Inc. Dissent Mk4 – 22Arc – Coyote – Upper
Pros
- Compact and lightweight design, ideal for portability.
- Low recoil, making it suitable for extended shooting sessions.
- Unique 22 ARC caliber offers a flatter trajectory than 22LR.
- Acceptable accuracy for varmint hunting and recreational shooting.
- Compatible with standard AR-15 lowers and many accessories.
Cons
- Higher price point compared to standard AR-15 uppers.
- Requires a break-in period for optimal reliability.
- Cleaning and maintenance are slightly more involved than a standard AR-15.
Who Should Buy CMMG Inc. Dissent Mk4 – 22Arc – Coyote – Upper?
Perfect for: Varmint hunters looking for a compact and lightweight rifle, recreational shooters seeking a low-recoil experience, and AR-15 enthusiasts who want to experiment with a unique platform.
Who should skip this product? Shooters on a tight budget, those who prioritize ultimate reliability above all else, and those unfamiliar with the AR-15 platform.
Must-have accessories or modifications? A quality optic suitable for varmint hunting, a reliable AR-15 lower receiver, and a good supply of 22 ARC ammunition.
Conclusion on CMMG Inc. Dissent Mk4 – 22Arc – Coyote – Upper
The CMMG Inc. Dissent Mk4 – 22Arc – Coyote – Upper is an innovative and well-designed product. It offers a unique shooting experience in a compact and lightweight package. The 22 ARC caliber provides a flat trajectory and acceptable accuracy for varmint hunting at moderate ranges.
The price is certainly a consideration. However, the unique features and performance of the CMMG Dissent justify the cost for those seeking a specialized platform.
I would recommend it to anyone looking for a compact, low-recoil, and accurate varmint hunting upper. It is a niche product, but it excels within its intended role. If you are looking to build a unique and portable AR-15, the CMMG Dissent is definitely worth considering. Check out the CMMG Inc. Dissent Mk4 – 22Arc – Coyote – Upper today and experience the future of compact AR platforms!