First Impressions of CMMG MAGAZINE MK4 / AR15 4.6X30 40RD A26E2083
The CMMG MAGAZINE MK4 / AR15 4.6X30 40RD A26E2083 promises to be a high-capacity solution for AR-15 platforms chambered in the unique 4.6x30mm caliber, a round originally developed for the HK MP7. CMMG is known for its innovative approach to firearms and accessories, and this magazine aims to provide increased firepower and reduced reloading time for shooters using 4.6x30mm AR-15 builds. This magazine immediately piqued my interest due to the scarcity of high-quality, high-capacity options in this relatively niche caliber.
I was initially looking for a reliable magazine that could keep up with the demands of training scenarios and potentially even tactical applications. The standard capacity magazines felt limiting, and I wanted a solution that would allow me to focus on the task at hand without constantly worrying about reloads.
Upon unboxing the CMMG MAGAZINE MK4 / AR15 4.6X30 40RD A26E2083, my first impression was positive. The magazine felt solid and well-built, with a sturdy polymer body and what appeared to be a robust spring. The weight was appropriate for a 40-round magazine; it wasn’t overly heavy, but it didn’t feel flimsy either.
Compared to standard 30-round AR-15 magazines in 5.56 NATO, this CMMG magazine is noticeably longer. Other options in this caliber are limited, but I did consider some lower-capacity magazines before settling on this one. I chose the CMMG magazine for its significantly higher capacity and the manufacturer’s reputation for quality.
My initial reaction was excitement combined with a healthy dose of skepticism. I was eager to see if the magazine could live up to its promise of reliable feeding and consistent performance. The 4.6x30mm round can be finicky, and magazines are often the weak point in any firearm system.
Real-World Testing: Putting CMMG MAGAZINE MK4 / AR15 4.6X30 40RD A26E2083 to the Test
First Use Experience
I tested the CMMG MAGAZINE MK4 / AR15 4.6X30 40RD A26E2083 at an outdoor shooting range, focusing on rapid-fire drills and controlled pairs. The weather was dry and sunny, providing ideal testing conditions.
The magazine performed well initially. Loading was relatively easy, though the last few rounds required a bit more effort. The magazine seated firmly in the magazine well, and I experienced no issues with feeding or cycling during the first few magazines.
However, after about 100 rounds, I noticed a few failures to feed. The bolt would occasionally fail to strip a round from the magazine, resulting in a click instead of a bang. This was intermittent, but concerning.
Extended Use & Reliability
After several weeks and hundreds of rounds, the reliability of the CMMG MAGAZINE MK4 / AR15 4.6X30 40RD A26E2083 remained inconsistent. Failures to feed occurred sporadically, sometimes several times in a single magazine, other times not at all.
Visually, the magazine shows minimal signs of wear and tear. The polymer body is holding up well, and the feed lips appear to be in good condition.
Maintenance is straightforward. I disassembled the magazine for cleaning after each range session, and the components are easy to access and reassemble. I suspect the spring might be the issue, but I have yet to replace it.
My previous experiences with CMMG products have generally been positive, so this magazine’s performance was somewhat disappointing. It doesn’t quite live up to the reliability I expect from a high-quality magazine, particularly at this price point.
Breaking Down the Features of CMMG MAGAZINE MK4 / AR15 4.6X30 40RD A26E2083
Specifications
Manufacturer: CMMG.
Caliber: 4.6x30mm.
Magazine Capacity: 40 Rounds.
Platform: AR-15 (MK4).
Material: Polymer body with steel spring.
Compatibility: Designed specifically for AR-15 platforms chambered in 4.6x30mm.
The high capacity allows for extended shooting sessions and reduces the need for frequent reloads. The polymer construction keeps the weight down while providing adequate durability.
Performance & Functionality
When it functions correctly, the CMMG MAGAZINE MK4 / AR15 4.6X30 40RD A26E2083 performs admirably. The increased capacity is a significant advantage, especially in dynamic shooting scenarios.
However, the intermittent failures to feed detract from its overall performance. A magazine’s primary function is to reliably feed ammunition, and this magazine falls short of that standard at times.
The magazine’s strengths lie in its high capacity and ease of loading. Its weakness is the inconsistent feeding reliability.
Design & Ergonomics
The CMMG MAGAZINE MK4 / AR15 4.6X30 40RD A26E2083 is designed with a focus on functionality. The polymer body is robust and provides a good grip.
The magazine is slightly longer than standard AR-15 magazines, but the added length doesn’t significantly impact handling. There is a slight learning curve associated with loading the higher-capacity magazine, but it’s minimal.
Durability & Maintenance
The polymer body appears to be durable and resistant to impacts and abrasion. I expect the magazine to last for a reasonable amount of time, provided the feeding issues can be resolved.
Maintenance is simple. Disassembly and cleaning are easy, and the magazine can be quickly reassembled.
Accessories and Customization Options
The CMMG MAGAZINE MK4 / AR15 4.6X30 40RD A26E2083 doesn’t come with any accessories. It’s a standalone magazine designed to fit standard AR-15 magazine wells.
There are no specific customization options for the magazine itself. However, users can potentially replace the spring with a higher-quality aftermarket spring to improve reliability.
Pros and Cons of CMMG MAGAZINE MK4 / AR15 4.6X30 40RD A26E2083
Pros
- High Capacity: The 40-round capacity provides a significant advantage in terms of firepower and reduces reload frequency.
- Durable Construction: The polymer body is robust and resistant to wear and tear.
- Easy to Load: Despite the high capacity, the magazine is relatively easy to load, even without a loading tool.
- Easy to Maintain: Disassembly and cleaning are straightforward.
- Positive Lock-Up: The magazine seats firmly and securely in the magazine well.
Cons
- Inconsistent Reliability: The magazine suffers from intermittent failures to feed, which can be frustrating and compromise its effectiveness.
- Proprietary Caliber: The magazine is only compatible with AR-15 platforms chambered in 4.6x30mm, limiting its versatility.
Who Should Buy CMMG MAGAZINE MK4 / AR15 4.6X30 40RD A26E2083?
The CMMG MAGAZINE MK4 / AR15 4.6X30 40RD A26E2083 is perfect for recreational shooters and competitive shooters who value high capacity and are willing to troubleshoot potential reliability issues. It’s also suitable for individuals who use 4.6x30mm AR-15s for training and want to minimize reloading time.
This product should be skipped by those who require absolute reliability from their magazines, especially in tactical or defensive situations. If consistent feeding is paramount, it’s best to explore other options or invest in extensive testing and potential modifications to improve this magazine’s performance.
A must-have accessory would be a high-quality magazine loader to assist with loading the 40-round capacity. Upgrading the magazine spring might also improve reliability.
Conclusion on CMMG MAGAZINE MK4 / AR15 4.6X30 40RD A26E2083
The CMMG MAGAZINE MK4 / AR15 4.6X30 40RD A26E2083 offers a compelling combination of high capacity and durable construction, but its inconsistent reliability is a significant drawback. While the increased firepower is appealing, the potential for failures to feed diminishes its overall value.
The price of $44.59 is reasonable for a high-capacity magazine, but the reliability issues make it difficult to justify the cost. A magazine that doesn’t reliably feed ammunition is essentially useless.
I would only recommend this magazine with reservations. If you are willing to experiment with modifications and are not overly concerned about absolute reliability, it might be worth considering. However, for serious applications where consistent performance is critical, I would advise exploring alternative options.
Ultimately, the CMMG MAGAZINE MK4 / AR15 4.6X30 40RD A26E2083 is a mixed bag. Its high capacity is a definite plus, but its inconsistent feeding reliability prevents it from being a truly outstanding product. Consider your needs carefully before making a purchase.