CMMG BANSHEE MK4 UPPER GROUP .22 LR 4.5 Black Review

First Thoughts on the CMMG BANSHEE MK4 UPPER GROUP .22 LR 4.5 Black

The CMMG BANSHEE MK4 UPPER GROUP .22 LR 4.5 Black promises AR-15 aesthetics and modularity in a .22 LR package. It’s designed for seamless integration with existing AR-15 lowers and uses CMMG‘s .22 AR Conversion Mags. The short 4.5-inch barrel and all-black Cerakote finish give it a distinct, tactical look.

I’ve always enjoyed the AR platform, but the cost of ammo for frequent training can be prohibitive. I was looking for a .22 LR conversion that would allow me to train more affordably without sacrificing the AR’s ergonomics and manual of arms. A dedicated .22 LR upper seemed like a better solution than a conversion kit, offering potentially improved reliability and accuracy.

Upon receiving the upper, I was immediately struck by its solid feel. The billet 6061 T6 aluminum upper receiver exudes quality, and the black Cerakote finish is evenly applied. The ZEROED accessories—charging handle, flash hider, and dust cover—are nice touches that indicate attention to detail.

I considered the similar offerings from other manufacturers, but the CMMG stood out due to its reputation for reliability and the comprehensive package. Many other .22 LR uppers require separate purchases for magazines or charging handles. The complete package of the CMMG BANSHEE MK4 UPPER GROUP .22 LR 4.5 Black made it an easy choice.

My first impression was definitely positive. It felt like a high-quality product that could offer a fun and affordable way to train and plink. I was eager to mate it with my AR lower and put it through its paces at the range.

Real-World Testing: Putting CMMG BANSHEE MK4 UPPER GROUP .22 LR 4.5 Black to the Test

First Use Experience

My initial test was at an outdoor shooting range on a sunny, moderately warm day. I mounted the CMMG BANSHEE MK4 UPPER GROUP .22 LR 4.5 Black onto a standard AR-15 lower receiver with a mil-spec trigger. Using CMMG‘s .22 AR Conversion Mags, I loaded up with CCI Mini-Mags, a common and reliable .22 LR ammunition.

The first few magazines ran flawlessly. The blowback action cycled smoothly, and the trigger felt crisp. The 4.5-inch barrel made for a very compact and maneuverable package, perfect for quick target acquisition.

After about 100 rounds, I experienced a few failures to extract. I suspect it was due to the .22LR ammunition being a bit dirty, as switching to a fresh magazine seemed to resolve the issue. Overall, the first experience was positive, showcasing the upper’s potential for fun and accurate shooting.

Extended Use & Reliability

After several months of use, the CMMG BANSHEE MK4 UPPER GROUP .22 LR 4.5 Black has proven to be a reliable and enjoyable addition to my range setup. I’ve put several thousand rounds through it, using a variety of .22 LR ammunition types, from high-velocity to standard velocity. Regular cleaning is essential to maintain its performance.

While it’s not immune to malfunctions, especially with cheaper, dirtier ammunition, it’s generally very reliable when properly maintained. I’ve noticed some wear on the Cerakote finish around the ejection port, but this is purely cosmetic. The CMMG BANSHEE MK4 UPPER GROUP .22 LR 4.5 Black has held up well overall.

Compared to my previous experiences with .22 LR conversion kits, the CMMG upper is a significant step up. It offers better accuracy, more consistent cycling, and a more authentic AR-15 feel. It surpasses expectations by delivering a dedicated .22 LR shooting experience within the familiar AR platform.

Breaking Down the Features of CMMG BANSHEE MK4 UPPER GROUP .22 LR 4.5 Black

Specifications

• Caliber: .22 LR, offering inexpensive shooting and reduced recoil.
• Barrel Length: 4.5 inches, providing a very compact and maneuverable configuration.
• Weight: 2.2 lbs, which is lightweight, contributing to easy handling.
• Barrel Twist: 1:16, optimized for stabilizing .22 LR bullets.
• Barrel Material: 4140CM SBN, providing good strength and corrosion resistance.
• Muzzle Device: CMMG ZEROED Flash Hider, reducing muzzle flash.
• Muzzle Thread: 1/2 x 28, allowing for the attachment of common muzzle devices.
• Upper Receiver: Billet 6061 T6 Aluminum, offering a strong and lightweight platform.
• Hand Guard: CMMG EML4 M-LOK, providing ample space for accessories.
• Finish: Cerakote Standard, offering durability and a sleek appearance.
• Charging Handle: CMMG ZEROED Ambi, allowing for easy use by both left- and right-handed shooters.
• Operating System: Traditional Blowback, known for simplicity and reliability in .22 LR platforms.
• Barrel Contour: MT, providing a balance between weight and stiffness.

These specifications combine to create a lightweight, compact, and reliable .22 LR upper receiver group. The short barrel and M-LOK handguard make it ideal for close-quarters shooting and customization. The quality materials and Cerakote finish ensure long-term durability.

Performance & Functionality

The CMMG BANSHEE MK4 UPPER GROUP .22 LR 4.5 Black excels at its primary job: providing a fun and affordable .22 LR shooting experience within the AR-15 platform. Accuracy is surprisingly good for such a short barrel. I can consistently hit steel targets at 50 yards with ease.

The blowback action is generally reliable, but it’s crucial to use high-quality ammunition and keep the bolt clean. The biggest strength is its compatibility with standard AR-15 lowers, allowing you to use your existing triggers, stocks, and grips. The primary weakness is ammunition sensitivity; it can be finicky with certain brands.

It definitely meets my expectations for a .22 LR upper. It’s a great training tool and a fun plinker. The ability to use my existing AR-15 lower makes it a versatile and cost-effective option.

Design & Ergonomics

The build quality is excellent. The materials used are top-notch, and the overall fit and finish are impressive. The weight is very manageable, making it comfortable to shoot for extended periods.

The design is user-friendly, mirroring the controls and ergonomics of a standard AR-15. There’s virtually no learning curve for anyone familiar with the platform. The M-LOK handguard provides ample space for mounting accessories such as lights, lasers, and forward grips.

Durability & Maintenance

With proper care and maintenance, the CMMG BANSHEE MK4 UPPER GROUP .22 LR 4.5 Black should last for many years. Regular cleaning is essential, especially the bolt and chamber, to prevent malfunctions. Spare parts are readily available from CMMG and other aftermarket suppliers.

Maintenance is relatively easy. The bolt can be easily removed for cleaning, and the barrel can be cleaned with a standard cleaning rod. A few drops of oil on the bolt rails will keep it running smoothly.

Accessories and Customization Options

The CMMG BANSHEE MK4 UPPER GROUP .22 LR 4.5 Black comes with a ZEROED AR15 Polymer Dust Cover, a ZEROED .22LR Ambi Charging Handle, and a ZEROED .22LR Flash Hider. The M-LOK handguard offers plenty of real estate for attaching accessories such as weapon lights, lasers, and vertical grips.

The upper is fully compatible with any standard AR-15 lower receiver. You can customize it with your preferred stock, pistol grip, and trigger. It is also compatible with various red dot sights and other optics.

Pros and Cons of CMMG BANSHEE MK4 UPPER GROUP .22 LR 4.5 Black

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Who Should Buy CMMG BANSHEE MK4 UPPER GROUP .22 LR 4.5 Black?

The CMMG BANSHEE MK4 UPPER GROUP .22 LR 4.5 Black is perfect for AR-15 enthusiasts who want a cost-effective way to train and plink. It’s also great for anyone looking for a compact and lightweight .22 LR firearm for recreational shooting or small game hunting.

Those who prioritize absolute reliability with all types of ammunition might want to consider other options. Also, if you dislike regular cleaning and maintenance, this may not be the upper for you.

Must-have accessories include high-quality .22 LR magazines, a reliable red dot sight, and a good cleaning kit. Upgrading the trigger can also enhance the shooting experience.

Conclusion on CMMG BANSHEE MK4 UPPER GROUP .22 LR 4.5 Black

The CMMG BANSHEE MK4 UPPER GROUP .22 LR 4.5 Black is a well-built, reliable, and fun .22 LR upper receiver group that seamlessly integrates with the AR-15 platform. It offers a cost-effective way to train, plink, and enjoy the AR-15’s ergonomics and modularity.

The price is justified by the quality of the components, the comprehensive package, and the overall performance. It is well worth the investment for those seeking a dedicated .22 LR AR-15 experience.

I wholeheartedly recommend the CMMG BANSHEE MK4 UPPER GROUP .22 LR 4.5 Black to anyone looking to expand their AR-15 collection with a versatile and affordable .22 LR option. Upgrade your AR-15 today and experience the joy of .22 LR shooting!

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