First Impressions of CMMG DISSENT Mk4, 300BLK, 16.1in Upper Receiver
The CMMG DISSENT Mk4, 300BLK, 16.1in Upper Receiver promises a unique shooting experience by ditching the traditional AR buffer tube. CMMG aims to deliver a compact and powerful platform in the popular .300 Blackout caliber. This upper receiver boasts a 16.1-inch barrel, a non-reciprocating side charger, and a direct impingement compact action.
I was initially drawn to this product because I was looking for a compact .300 Blackout upper receiver. I wanted something that could easily transition between subsonic and supersonic loads while maintaining accuracy and reliability. The promise of AR-15 component compatibility also appealed to me.
Upon unboxing, the CMMG DISSENT immediately impressed with its robust construction. The aluminum felt high-quality and the finish was impeccable. The side-charging handle was smooth and the overall design felt well-thought-out.
Compared to a standard AR-15 upper receiver, the DISSENT offers a significantly shorter overall length due to the absence of the buffer tube. A comparable product might be a short-barreled AR pistol upper with a brace, but those still require some sort of buffer system. I chose the DISSENT for its compact design and innovative recoil system.
My first impression was excitement mixed with a healthy dose of skepticism. I was eager to see if it would live up to the hype, given its unique design.
Real-World Testing: Putting CMMG DISSENT Mk4, 300BLK, 16.1in Upper Receiver to the Test
First Use Experience
My first experience with the CMMG DISSENT was at an outdoor shooting range. I tested it with both supersonic and subsonic .300 Blackout ammunition. The weather was clear and dry, around 70 degrees Fahrenheit.
The DISSENT performed admirably. Cycling was smooth with both types of ammunition after adjusting the gas. The side-charging handle made reloading quick and intuitive without disrupting my sight picture.
I did notice a slightly different recoil impulse compared to a traditional AR-15. However, it was manageable and didn’t affect accuracy.
Extended Use & Reliability
After several months of regular use, the CMMG DISSENT has proven to be a reliable performer. I’ve put hundreds of rounds through it. It includes various .300 Blackout loads, without any significant issues.
The finish has held up well, showing only minor signs of wear on high-contact areas. Cleaning the DISSENT is straightforward, similar to a standard AR-15. The compact action design allows for easy access to the bolt carrier group.
Compared to previous experiences with other .300 Blackout platforms, the CMMG DISSENT offers a unique combination of compactness and performance. It surpasses expectations in terms of reliability and ease of use.
Breaking Down the Features of CMMG DISSENT Mk4, 300BLK, 16.1in Upper Receiver
Specifications
- Caliber: .300 AAC Blackout. This allows for versatile use with both subsonic and supersonic ammunition.
- Overall Length: 25.5 inches. This compact length makes it ideal for storage and maneuverability.
- Barrel Length: 16.1 inches. This length provides optimal performance for the .300 Blackout cartridge.
- Barrel Twist Rate: 1-7. The 1-7 twist rate effectively stabilizes a wide range of bullet weights commonly used in .300 Blackout.
- Threads per Inch: 5/8×24. This is the standard thread pitch for .30 caliber barrels, allowing for compatibility with a wide range of muzzle devices.
- Muzzle Device: CMMG Zeroed Muzzle Brake. The included muzzle brake helps to reduce recoil.
- Fabric/Material: Aluminum. Aluminum construction provides a lightweight yet durable platform.
- Gas Block Journal Size-Diameter: .750 in. This is a standard size for AR-15 gas blocks, providing compatibility with aftermarket options.
- Gun Rail: M-LOK. M-LOK provides a versatile and lightweight mounting platform for accessories.
- Weight: 4.85 lbs. Its lightweight design enhances maneuverability and reduces fatigue during extended use.
- Magazine Included: No. This allows users to choose their preferred magazines.
Performance & Functionality
The CMMG DISSENT Mk4 performs exceptionally well. It delivers consistent accuracy and reliable cycling with various .300 Blackout loads. The strengths lie in its compact design, smooth side-charging action, and overall reliability.
One area for potential improvement would be the adjustability of the gas system. While it functions well, more granular control could benefit users fine-tuning for specific ammunition. The DISSENT meets and even exceeds expectations, delivering a unique and capable platform.
Design & Ergonomics
The build quality is excellent. The aluminum construction feels solid and durable. Its weight is well-balanced, making it comfortable to handle and shoot.
The DISSENT is relatively user-friendly, although the side-charging handle requires a slight learning curve for those accustomed to traditional AR-15 charging handles. The included 1913 Picatinny rail end plate is a thoughtful addition, allowing for easy attachment of stocks or braces.
Durability & Maintenance
The CMMG DISSENT appears to be built to last. Its components are high-quality and the finish is durable. Regular cleaning and lubrication are all that’s needed to keep it running smoothly.
The design allows for relatively easy access to critical components for maintenance and repair. This is crucial for ensuring longevity and reliable performance in the field.
Accessories and Customization Options
The CMMG DISSENT Mk4 comes with a CMMG Zeroed Muzzle Brake and a 1913 Picatinny rail end plate. It is compatible with standard AR-15 magazines and triggers. The M-LOK handguard allows for the attachment of various accessories, such as lights, lasers, and foregrips.
Aftermarket options include different muzzle devices, optics, and stocks or braces compatible with the 1913 Picatinny rail. The compatibility with AR-15 components makes customization relatively easy and affordable.
Pros and Cons of CMMG DISSENT Mk4, 300BLK, 16.1in Upper Receiver
Pros
- Extremely compact design due to the absence of a buffer tube.
- Reliable cycling with both supersonic and subsonic .300 Blackout ammunition.
- Smooth side-charging action for quick and intuitive reloading.
- High-quality aluminum construction for durability and lightweight.
- M-LOK handguard for versatile accessory mounting.
Cons
- Different recoil impulse compared to a traditional AR-15 (takes some getting used to).
- Gas system adjustment could benefit from more granular control.
Who Should Buy CMMG DISSENT Mk4, 300BLK, 16.1in Upper Receiver?
Perfect for: Shooters looking for a compact and reliable .300 Blackout platform. Also, those prioritizing maneuverability and ease of storage. This includes hunters, tactical shooters, and those seeking a capable home defense weapon.
Who should skip this product? Shooters who are strictly accustomed to the traditional AR-15 recoil impulse. Also, those who require ultra-precise gas system tuning for specialized ammunition.
Must-have accessories or modifications? A quality optic is essential for maximizing accuracy. Also, a brace or stock compatible with the 1913 Picatinny rail end plate. Finally, a suppressor will enhance the .300 Blackout’s subsonic capabilities.
Conclusion on CMMG DISSENT Mk4, 300BLK, 16.1in Upper Receiver
The CMMG DISSENT Mk4, 300BLK, 16.1in Upper Receiver is a well-engineered and innovative platform that delivers on its promises. Its compact design, reliable performance, and high-quality construction make it a standout option in the .300 Blackout market. The price of $1159.00 is justified. The value is there given the unique features and capabilities it offers.
I would highly recommend the CMMG DISSENT to anyone seeking a compact, reliable, and versatile .300 Blackout upper receiver. Experience the difference and unlock a new level of shooting performance!