First Impressions of CMMG 28B260CMB RESOLUTE MK4 22ARC 16.1 MDBRZ
The CMMG 28B260CMB RESOLUTE MK4 22ARC 16.1 MDBRZ, a rifle chambered in the increasingly popular 22 ARC (Advanced Rifle Cartridge), immediately piqued my interest. Coming from CMMG, a manufacturer known for its innovative approach to AR-platform firearms, I expected a well-built and reliable rifle. The 22 ARC cartridge promises a flatter trajectory and greater energy on target compared to the ubiquitous .223/5.56, making it potentially ideal for varmint hunting and longer-range target shooting.
I’ve been searching for a versatile AR platform that offers improved ballistics over the 5.56, but with manageable recoil for extended training sessions. Many higher caliber ARs can be punishing after a few hours on the range. The promise of the 22 ARC fulfilling this need is what ultimately drew me to this specific CMMG Resolute MK4 model.
Unboxing the rifle revealed a clean, well-finished firearm. The build quality seemed solid, with no noticeable blemishes or loose parts. The “MDBRZ” (Midnight Bronze?) finish appeared durable and aesthetically pleasing. While the rifle itself felt relatively lightweight, it still possessed a substantial feel indicating quality construction.
I had considered other AR-platform rifles like the Springfield Armory Saint Victor and the Daniel Defense DDM4 V7. I chose the CMMG Resolute MK4 primarily because of its chambering in 22 ARC, which, at the time, offered a unique ballistic advantage. I also appreciated CMMG’s reputation for reliability and innovation, particularly with their Radial Delayed Blowback system found in some of their other platforms.
My first impression was one of cautious optimism. The rifle looked and felt well-made, and the 22 ARC chambering held considerable promise. I was eager to get it to the range and see if it lived up to the hype.
Real-World Testing: Putting CMMG 28B260CMB RESOLUTE MK4 22ARC 16.1 MDBRZ to the Test
First Use Experience
My initial testing of the CMMG 28B260CMB RESOLUTE MK4 22ARC 16.1 MDBRZ took place at my local outdoor shooting range. I set up targets at distances ranging from 100 to 300 yards to evaluate the rifle’s accuracy and the 22 ARC’s ballistic performance. The weather was clear and mild, providing ideal shooting conditions.
The rifle was surprisingly easy to handle, even with the slightly longer 16.1-inch barrel. Recoil was noticeably lighter than a standard 5.56 AR, making it comfortable for rapid follow-up shots. I experienced no malfunctions or failures to feed during the first range session.
After the initial range trip, I noticed the trigger felt a little gritty, but that smoothed out with use. Otherwise, the rifle performed flawlessly out of the box.
Extended Use & Reliability
After several months of regular use, the CMMG 28B260CMB RESOLUTE MK4 22ARC 16.1 MDBRZ has proven to be a reliable and accurate platform. I’ve put several hundred rounds through it, primarily using Hornady’s 88gr ELD Match ammunition, with consistent performance. The rifle has also been used on a few varmint hunts.
The CMMG Resolute MK4 has held up remarkably well. The MDBRZ finish has shown no signs of wear, despite being exposed to brush and the elements. Cleaning and maintenance are straightforward, similar to any other AR-15 platform.
Compared to my previous AR experiences, the CMMG Resolute MK4 in 22 ARC offers a superior long-range shooting experience. The flatter trajectory and reduced wind drift of the 22 ARC have significantly improved my hit probability at distances beyond 200 yards. This makes it outperform my previous 5.56 platforms in terms of effective range and accuracy, without sacrificing the easy handling characteristics of the AR platform.
Breaking Down the Features of CMMG 28B260CMB RESOLUTE MK4 22ARC 16.1 MDBRZ
Specifications
The CMMG 28B260CMB RESOLUTE MK4 22ARC 16.1 MDBRZ boasts several key specifications that contribute to its performance. The rifle is chambered in 22 ARC (Advanced Rifle Cartridge), offering improved ballistics over traditional AR calibers. It features a 16.1-inch barrel, which strikes a good balance between maneuverability and velocity.
The CMMG Resolute MK4 has a standard AR-15 magazine well, but no magazines are included. This is a downside as you’ll need to source 22 ARC magazines, which can be more expensive and less readily available than standard AR mags. The overall weight is typical for an AR-15, making it easy to carry and handle.
These specifications are crucial because they directly influence the rifle’s accuracy, range, and overall handling characteristics. The 22 ARC chambering allows for flatter trajectories and reduced wind drift, while the 16.1-inch barrel optimizes bullet velocity for enhanced downrange performance.
Performance & Functionality
The CMMG 28B260CMB RESOLUTE MK4 22ARC 16.1 MDBRZ excels in accuracy and reliability. With match-grade ammunition, I’ve consistently achieved sub-MOA groups at 100 yards. The rifle’s functionality is smooth and intuitive, with familiar AR-15 controls.
One notable strength is the reduced recoil compared to larger caliber ARs. However, a potential weakness is the availability and cost of 22 ARC ammunition and magazines. Overall, the rifle meets and, in some areas, exceeds my expectations for a mid-priced AR platform.
Design & Ergonomics
The CMMG Resolute MK4 features a well-designed and ergonomic platform. The build quality is excellent, with high-quality materials used throughout. The rifle feels solid and well-balanced in hand.
The rifle uses standard AR-15 controls, so there’s minimal learning curve for experienced AR shooters. The adjustable stock and comfortable pistol grip allow for a customized fit, enhancing the overall shooting experience.
Durability & Maintenance
Based on my experience, the CMMG Resolute MK4 is built to last. The MDBRZ finish is durable and resistant to scratches and wear. The internal components appear to be of high quality, suggesting a long service life.
Maintenance is similar to any other AR-15, requiring regular cleaning and lubrication. Disassembly and reassembly are straightforward, allowing for easy maintenance in the field.
Accessories and Customization Options
The CMMG Resolute MK4 is highly customizable, thanks to its compatibility with standard AR-15 accessories. The rifle features a Picatinny rail for mounting optics, and M-LOK slots on the handguard for attaching accessories such as lights, lasers, and forward grips. You can easily customize the rifle to suit your specific needs and preferences.
Popular accessories such as Magpul stocks and grips are compatible, as are most AR-15 triggers. The only proprietary part seems to be the barrel and bolt designed for the 22 ARC cartridge.
Pros and Cons of CMMG 28B260CMB RESOLUTE MK4 22ARC 16.1 MDBRZ
Pros
- Superior Ballistics: The 22 ARC cartridge offers a flatter trajectory and reduced wind drift compared to 5.56.
- Excellent Accuracy: Consistently achieves sub-MOA groups with match-grade ammunition.
- Manageable Recoil: Reduced recoil allows for comfortable and accurate follow-up shots.
- High-Quality Construction: The rifle is built with durable materials and a robust design.
- AR-15 Compatibility: Compatible with a wide range of AR-15 accessories for customization.
Cons
- Magazine Not Included: No magazine is included with the rifle, adding to the initial cost.
- Ammunition Cost and Availability: 22 ARC ammunition and magazines can be more expensive and less readily available than other AR calibers.
Who Should Buy CMMG 28B260CMB RESOLUTE MK4 22ARC 16.1 MDBRZ?
Perfect for: Varmint hunters, target shooters looking for improved long-range performance in an AR platform, and those who appreciate the AR-15 platform but desire a flatter-shooting cartridge. This is a great rifle for shooters who want to push the range of their AR without the recoil of larger calibers.
Who should skip this product? Those on a tight budget, as the initial cost of the rifle and the ongoing expense of 22 ARC ammunition can be significant. Also, if you prioritize readily available and inexpensive ammunition, a 5.56 AR-15 might be a better choice.
Must-have accessories or modifications? A quality optic is essential to take advantage of the 22 ARC’s long-range capabilities. Consider a scope with adjustable parallax and a bullet drop compensator (BDC) reticle. Also, ensure you purchase a few 22 ARC magazines, as none are included.
Conclusion on CMMG 28B260CMB RESOLUTE MK4 22ARC 16.1 MDBRZ
The CMMG 28B260CMB RESOLUTE MK4 22ARC 16.1 MDBRZ is a well-built and accurate AR-platform rifle that offers a compelling alternative to traditional calibers. The 22 ARC chambering provides a significant ballistic advantage, making it ideal for varmint hunting and longer-range target shooting. While the cost and availability of ammunition are potential drawbacks, the rifle’s performance and quality justify the price for those seeking a superior AR experience.
I would personally recommend the CMMG Resolute MK4 in 22 ARC to anyone looking for a versatile and accurate AR platform with improved long-range capabilities. If you’re ready to invest in a rifle that pushes the boundaries of AR performance, then the CMMG 28B260CMB RESOLUTE MK4 22ARC 16.1 MDBRZ is definitely worth considering. Go ahead, take the leap and experience the difference!