CMMG 28B3D0CCG ENDEAVOR MK4 22ARC 20 CHGRN Review

First Impressions of CMMG 28B3D0CCG ENDEAVOR MK4 22ARC 20 CHGRN

The CMMG 28B3D0CCG ENDEAVOR MK4 22ARC 20 CHGRN is a dedicated 22 ARC upper receiver group designed to breathe new life into your existing AR-15 lower. CMMG is well-known for its innovative approach to firearms, particularly in the realm of rimfire AR conversions and dedicated platforms. The ENDEAVOR MK4 promises to deliver a reliable and accurate 22 ARC experience in a familiar AR-15 package. This specific model, with its 20-inch barrel and charging handle, piqued my interest as a potential varmint rifle and long-range 22LR trainer.

For years, I’ve relied on various AR-15 platforms for everything from tactical training to small game hunting. However, the rising cost of centerfire ammunition and the desire for quieter practice sessions led me on the hunt for a high-quality 22LR option. I was specifically seeking an upper receiver group that would maintain the familiar AR-15 ergonomics while providing the affordability and low recoil of the 22LR cartridge.

My initial unboxing experience was positive. The upper receiver felt solid and well-constructed, with a clean Cerakote finish. The charging handle felt smooth, and the overall fit and finish instilled confidence.

Before settling on the CMMG ENDEAVOR MK4, I considered the dedicated Smith & Wesson M&P 15-22 and the various 22LR conversion kits available. The M&P 15-22, while a great rifle, didn’t offer the modularity I wanted. Conversion kits, on the other hand, often suffer from reliability issues and don’t always deliver the accuracy I was seeking. The CMMG ENDEAVOR MK4 appeared to strike the perfect balance between a dedicated 22LR platform and AR-15 compatibility.

My first impression of the CMMG 28B3D0CCG ENDEAVOR MK4 22ARC 20 CHGRN was one of cautious optimism. I was excited to get it to the range and see if it lived up to the CMMG reputation for quality and performance. I sincerely hoped it would address my need for affordable and reliable 22LR training and varmint control.

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Real-World Testing: Putting CMMG 28B3D0CCG ENDEAVOR MK4 22ARC 20 CHGRN to the Test

First Use Experience

My first range trip with the CMMG 28B3D0CCG ENDEAVOR MK4 22ARC 20 CHGRN was at my local outdoor range. I mounted it on a standard AR-15 lower receiver with a crisp trigger and a comfortable stock.

The initial conditions were slightly breezy but clear. I ran a variety of 22LR ammunition through the CMMG ENDEAVOR MK4, including CCI Mini-Mags, Federal Automatch, and some bulk-pack Remington. It took a couple of magazines to get the rifle dialed in, but after that, the accuracy was surprisingly good.

There were no significant issues during the first use. The rifle cycled reliably with the CCI Mini-Mags and Federal Automatch, with only a few minor hiccups with the bulk-pack Remington. The 20-inch barrel provided a noticeable increase in velocity compared to shorter-barreled 22LR pistols and rifles.

Extended Use & Reliability

After several months of regular use, the CMMG 28B3D0CCG ENDEAVOR MK4 22ARC 20 CHGRN has proven to be a reliable and enjoyable addition to my collection. I’ve put hundreds of rounds through it, and it continues to perform consistently.

The Cerakote finish has held up remarkably well. There are no significant signs of wear and tear, even after being exposed to various weather conditions and range environments.

Maintenance is straightforward. After each range trip, I simply clean the barrel, bolt, and charging handle with standard gun cleaning supplies. The CMMG ENDEAVOR MK4 is easy to disassemble and reassemble, making maintenance quick and efficient.

Compared to previous 22LR platforms I’ve used, the CMMG ENDEAVOR MK4 outperforms them in terms of accuracy and reliability. It provides a consistent and enjoyable shooting experience that closely mimics that of a centerfire AR-15, making it an excellent training tool. It has become my go-to rifle for small game hunting and enjoyable plinking.

Breaking Down the Features of CMMG 28B3D0CCG ENDEAVOR MK4 22ARC 20 CHGRN

Specifications

The CMMG 28B3D0CCG ENDEAVOR MK4 22ARC 20 CHGRN boasts several key specifications that contribute to its overall performance and user experience.

• Caliber: 22LR (22 ARC). This is a dedicated 22LR upper receiver group designed specifically for the 22LR cartridge, ensuring optimal performance and reliability.
• Barrel Length: 20 inches. The longer barrel provides increased velocity and improved accuracy, making it suitable for varmint hunting and target shooting.
• Magazine Capacity: N/A (Requires CMMG 22LR Magazines). This model does not include a magazine. It requires dedicated CMMG 22LR AR conversion magazines, which are sold separately.
• Materials: High-quality steel and aluminum with a Cerakote finish. This construction provides durability and resistance to corrosion.
• Charging Handle: Included. Comes with a standard AR-15 charging handle.

These specifications are important because they directly impact the rifle’s performance and usability. The 22LR caliber offers affordability and low recoil, while the 20-inch barrel enhances accuracy and range. The high-quality materials ensure that the upper receiver can withstand the rigors of regular use.

Performance & Functionality

The CMMG 28B3D0CCG ENDEAVOR MK4 22ARC 20 CHGRN performs exceptionally well in its intended role.

Accuracy is impressive, with consistent groupings at 50 yards and reasonable accuracy out to 100 yards with quality ammunition. Reliability is generally good, although it is important to use high-quality 22LR ammunition and ensure that the magazines are properly maintained. Usability is excellent, as the upper receiver group seamlessly integrates with standard AR-15 lower receivers.

One notable strength is its accuracy. I was consistently able to achieve sub-MOA groups at 50 yards with CCI Mini-Mags. One weakness is its ammunition sensitivity. It can be finicky with certain bulk-pack 22LR ammunition, which can lead to occasional malfunctions.

Overall, the CMMG 28B3D0CCG ENDEAVOR MK4 22ARC 20 CHGRN meets and exceeds expectations. It delivers a reliable and accurate 22LR shooting experience in a familiar AR-15 platform.

Design & Ergonomics

The CMMG 28B3D0CCG ENDEAVOR MK4 22ARC 20 CHGRN features a well-thought-out design and comfortable ergonomics.

The build quality is excellent. The materials used are high-quality, and the overall construction is solid and durable. The weight is well-balanced, making it comfortable to shoot for extended periods.

The design is user-friendly. There is no significant learning curve for anyone familiar with the AR-15 platform. The controls are intuitive and easy to access.

Durability & Maintenance

The CMMG 28B3D0CCG ENDEAVOR MK4 22ARC 20 CHGRN is built to last.

With proper care and maintenance, it should provide years of reliable service. Maintenance is straightforward. Regular cleaning and lubrication are all that is required to keep it running smoothly.

Accessories and Customization Options

The CMMG 28B3D0CCG ENDEAVOR MK4 22ARC 20 CHGRN is compatible with a wide range of AR-15 accessories.

• Optics: Any standard AR-15 optic, such as a red dot sight or scope, can be mounted on the Picatinny rail.
• Magazines: Requires dedicated CMMG 22LR AR conversion magazines.
• Triggers: Compatible with most aftermarket AR-15 triggers, allowing for customization of the trigger pull.

The compatibility with popular AR-15 accessories makes the CMMG ENDEAVOR MK4 highly versatile and customizable. This allows users to tailor the rifle to their specific needs and preferences.

Pros and Cons of CMMG 28B3D0CCG ENDEAVOR MK4 22ARC 20 CHGRN

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Who Should Buy CMMG 28B3D0CCG ENDEAVOR MK4 22ARC 20 CHGRN?

The CMMG 28B3D0CCG ENDEAVOR MK4 22ARC 20 CHGRN is perfect for varmint hunters, target shooters, and anyone looking for an affordable and reliable 22LR AR-15 platform. It is also an excellent training tool for those who want to practice with an AR-15 without the cost and recoil of centerfire ammunition.

Those who should skip this product are individuals who primarily shoot bulk-pack 22LR ammunition and are unwilling to invest in high-quality magazines or ammunition.

A must-have accessory is a set of reliable CMMG 22LR AR conversion magazines. An upgraded trigger can also enhance the shooting experience.

Conclusion on CMMG 28B3D0CCG ENDEAVOR MK4 22ARC 20 CHGRN

The CMMG 28B3D0CCG ENDEAVOR MK4 22ARC 20 CHGRN is a well-designed and high-performing 22LR upper receiver group that offers excellent value for the price.

The price is justified by its accuracy, reliability, and AR-15 compatibility.

I would personally recommend it to anyone looking for a dedicated 22LR AR-15 platform.

If you’re in the market for a reliable and accurate 22LR upper receiver group, the CMMG 28B3D0CCG ENDEAVOR MK4 22ARC 20 CHGRN is an excellent choice. Invest in some quality magazines and ammunition, and you’ll have a rifle that will provide years of enjoyable shooting.