The CMMG 28B3D0CMB Endeavor 22 ARC 20″ Upper – Midnight Bronze Made a Bold First Impression
The CMMG 28B3D0CMB Endeavor 22 ARC 20″ Upper – Midnight Bronze isn’t just another AR-15 upper receiver; it’s a dedicated .22 ARC system designed to bring affordable, accurate, and enjoyable long-range shooting to the AR platform. The CMMG name carries weight in the AR world, known for their innovative conversion kits and dedicated .22LR firearms. This upper promises a seamless integration with existing AR lowers, offering a cost-effective way to train, plink, or even compete without breaking the bank on centerfire ammunition.
My interest in the Endeavor 22 ARC stemmed from a desire to extend my effective range with .22LR. I wanted a platform that felt and functioned like my AR-15, allowing for consistent training across multiple calibers without the hefty price tag of centerfire rounds. The promise of sub-MOA accuracy with the .22 ARC cartridge sealed the deal for me.
Unboxing the upper, the first thing that struck me was the Midnight Bronze Cerakote finish. It’s a rich, deep color that immediately elevates the look of any AR lower. The weight felt substantial, instilling confidence in the build quality, and the 20-inch barrel gave it a serious, long-range aesthetic.
I considered other .22LR AR uppers, particularly those with simple conversion kits. However, I opted for the CMMG Endeavor 22 ARC because it is a dedicated system designed from the ground up for the .22 ARC cartridge. This promised better reliability and accuracy than a simple conversion.
My first impression was excitement mixed with anticipation. The Midnight Bronze finish looked fantastic, and the overall build quality felt solid. I was eager to see if it could live up to the accuracy claims and provide a truly enjoyable .22 ARC shooting experience.
Real-World Testing: Putting CMMG 28B3D0CMB Endeavor 22 ARC 20″ Upper – Midnight Bronze to the Test
First Use Experience
I took the CMMG 28B3D0CMB Endeavor 22 ARC 20″ Upper – Midnight Bronze to my local shooting range for its initial testing. I mounted it on my AR-15 lower, paired with a quality trigger and optic, and brought along a variety of .22 ARC ammunition to find what it liked best. The weather was slightly overcast, but the conditions were otherwise ideal for shooting.
The upper performed flawlessly right out of the box. I experienced no failures to feed or eject, and the bolt cycled smoothly. It was surprisingly accurate, even with bulk ammunition.
The CMMG upper was incredibly easy to use, requiring no special tools or modifications to install on my AR lower. The controls were identical to my standard AR-15, making the transition seamless. There were no immediate issues after the first range session, only a desire to shoot more.
Extended Use & Reliability
After several months of consistent use, the CMMG 28B3D0CMB Endeavor 22 ARC 20″ Upper – Midnight Bronze has proven to be a reliable and accurate training tool. I’ve put hundreds of rounds through it, and it continues to perform flawlessly with minimal maintenance. The Midnight Bronze Cerakote finish has held up well, showing no signs of wear and tear despite frequent use and cleaning.
Maintenance is simple, requiring only a standard AR-15 cleaning kit and solvent. I clean the bolt and barrel after each range session to ensure optimal performance. Compared to my experiences with .22LR conversion kits, the CMMG dedicated upper far outperforms them in terms of reliability and accuracy.
Breaking Down the Features of CMMG 28B3D0CMB Endeavor 22 ARC 20″ Upper – Midnight Bronze
Specifications
The CMMG 28B3D0CMB Endeavor 22 ARC 20″ Upper – Midnight Bronze is a purpose-built AR-15 upper receiver chambered in .22 ARC. It features a 20-inch 4140 Chrome Moly barrel with a 1:16 twist rate, optimized for the .22 ARC cartridge. The Midnight Bronze Cerakote finish provides excellent corrosion resistance and a distinctive aesthetic.
The upper is designed to work seamlessly with most standard AR-15 lower receivers. The 20-inch barrel contributes to increased muzzle velocity, enhancing the .22 ARC’s long-range capabilities. The dedicated .22 ARC bolt and barrel ensure reliable cycling and improved accuracy compared to conversion kits.
Performance & Functionality
The CMMG 28B3D0CMB Endeavor 22 ARC 20″ Upper – Midnight Bronze excels in accuracy and reliability. With quality ammunition, I consistently achieve sub-MOA groups at 50 yards and respectable accuracy out to 200 yards. The functionality is identical to a standard AR-15, making it easy to transition between calibers for training.
The primary strength is its accuracy, especially at longer .22LR distances. The main weakness might be ammo availability; .22 ARC is less common than .22LR, although it is becoming more popular. It exceeds my expectations as a dedicated long-range .22LR training platform.
Design & Ergonomics
The CMMG Endeavor 22 ARC features a well-thought-out design. The Midnight Bronze Cerakote finish is not only aesthetically pleasing but also provides excellent protection against the elements. The weight feels balanced on my AR-15 lower, making it comfortable to shoot for extended periods.
The upper is very user-friendly, requiring no special knowledge or tools to install. There is essentially no learning curve for anyone familiar with the AR-15 platform.
Durability & Maintenance
The high-quality materials and Cerakote finish suggest that the CMMG 28B3D0CMB Endeavor 22 ARC 20″ Upper – Midnight Bronze will last for many years with proper care. Regular cleaning and lubrication of the bolt and barrel are all that’s required for maintenance. The modular design of the AR-15 platform also makes it relatively easy to replace parts if necessary.
Accessories and Customization Options
The CMMG Endeavor 22 ARC upper comes as a complete unit, ready to install on any compatible AR-15 lower. The upper readily accepts standard AR-15 accessories, such as optics, handguards, and charging handles. The ability to customize the upper with aftermarket parts allows users to tailor it to their specific needs and preferences. I added a free-floating handguard and a magnified optic to optimize the upper for long-range shooting.
Pros and Cons of CMMG 28B3D0CMB Endeavor 22 ARC 20″ Upper – Midnight Bronze
Pros
- Exceptional accuracy with .22 ARC ammunition.
- Reliable cycling and consistent performance.
- High-quality construction and Midnight Bronze Cerakote finish.
- Seamless integration with standard AR-15 lowers.
- Excellent training tool for long-range shooting at a lower cost.
Cons
- .22 ARC ammunition can be less readily available than .22LR.
- Higher initial cost compared to .22LR conversion kits.
Who Should Buy CMMG 28B3D0CMB Endeavor 22 ARC 20″ Upper – Midnight Bronze?
The CMMG 28B3D0CMB Endeavor 22 ARC 20″ Upper – Midnight Bronze is perfect for shooters looking for an accurate and reliable long-range .22LR training platform. This is also a good choice for competitive shooters who participate in .22LR disciplines or anyone who wants to enjoy affordable, accurate shooting with their AR-15. Those on a very tight budget who only want to plink occasionally might find a .22LR conversion kit more suitable.
A must-have accessory is a quality optic to take advantage of the upper’s accuracy potential. High-quality .22 ARC ammunition will also make a significant difference in performance.
Conclusion on CMMG 28B3D0CMB Endeavor 22 ARC 20″ Upper – Midnight Bronze
The CMMG 28B3D0CMB Endeavor 22 ARC 20″ Upper – Midnight Bronze is a high-quality, accurate, and reliable .22 ARC upper receiver that transforms any AR-15 into a long-range .22LR platform. While the initial investment is higher than a conversion kit, the dedicated design and superior performance justify the price. I wholeheartedly recommend the CMMG Endeavor 22 ARC to anyone looking for a serious .22LR training tool or a fun and accurate plinker. If you’re ready to take your .22LR shooting to the next level, the CMMG 28B3D0CMB Endeavor 22 ARC 20″ Upper – Midnight Bronze is the way to go.