First Impressions of Mean Arms EndoMag 9mm Magazine Ejectorless CMMG Version 3-Pack
The Mean Arms EndoMag 9mm Magazine Ejectorless CMMG Version 3-Pack presents a clever solution for AR-15 enthusiasts looking to easily convert their standard 5.56 lower receiver to a 9mm platform. Mean Arms has created a drop-in insert that transforms your existing Gen 2 or Gen 3 PMAGs into functional 9mm magazines, eliminating the need for a dedicated 9mm lower. This ejectorless version caters specifically to those running CMMG’s Radial Delayed Blowback system, promising a smooth and reliable shooting experience.
My journey to this product began with a desire for a versatile AR-15 platform. I wanted to be able to quickly and easily switch between 5.56 and 9mm without the expense and hassle of owning multiple complete lowers.
Upon unboxing, the EndoMag inserts felt solid and well-constructed. The polymer seemed durable, and the spring tension felt appropriate for reliable feeding. They were lighter than I expected, which is a definite plus.
I initially considered a dedicated 9mm lower receiver, as well as magwell adapters for standard 5.56 magazines. However, the EndoMag system’s promise of utilizing existing PMAGs, maintaining the standard AR-15 lower, and requiring no permanent modifications ultimately swayed me. My first impression was one of cautious optimism; this seemed like a brilliant idea if it worked as advertised.
Real-World Testing: Putting Mean Arms EndoMag 9mm Magazine Ejectorless CMMG Version 3-Pack to the Test
First Use Experience
I tested the Mean Arms EndoMag 9mm Magazine Ejectorless CMMG Version 3-Pack at my local indoor shooting range. My AR-15 lower was mated to a CMMG Radial Delayed Blowback 9mm upper receiver. I cycled through various 9mm ammunition brands and bullet weights to gauge reliability.
The initial experience was mostly positive, although I did encounter a few hiccups. One EndoMag insert fed flawlessly from the start, while the other two required a slight “break-in” period of approximately 20 rounds each before achieving consistent feeding. Once broken in, however, all three performed reliably.
Extended Use & Reliability
After several range sessions and approximately 500 rounds fired through each EndoMag, I’m happy to report they have held up remarkably well. There are no signs of significant wear and tear. The polymer construction appears robust enough to withstand repeated use.
Maintenance is straightforward; a quick wipe down with a cloth and occasional lubrication of the spring is all that’s required. Compared to dealing with dedicated 9mm magazines, the EndoMag system simplifies cleaning and storage, especially when utilizing PMAGs I already own. The EndoMag performed as expected, and actually exceeded initial reliability concerns after the brief break-in.
Breaking Down the Features of Mean Arms EndoMag 9mm Magazine Ejectorless CMMG Version 3-Pack
Specifications
The Mean Arms EndoMag 9mm Magazine Ejectorless CMMG Version 3-Pack features a drop-in magazine insert designed for converting Gen 2 or Gen 3 5.56/.223 PMAGs. Each insert accepts 9mm Luger ammunition, providing a 10-round capacity in this specific configuration. The product is specifically designed for use with CMMG Radial Delayed Blowback systems and does not include an ejector.
These specifications are crucial for several reasons. The compatibility with PMAGs significantly reduces cost and increases convenience for AR-15 owners. The ejectorless design is essential for ensuring proper function with CMMG’s delayed blowback system, which uses the bolt face to eject the spent casing.
Performance & Functionality
The EndoMag’s primary function is to allow seamless conversion from 5.56 to 9mm within a standard AR-15 lower receiver. Once properly broken in, the feeding reliability is excellent. Accuracy is entirely dependent on the upper receiver and barrel, but the EndoMag contributes by ensuring consistent and smooth ammunition delivery.
The main strength of the system is its ability to utilize existing PMAGs, but the initial break-in period for some inserts could be seen as a weakness. Overall, the EndoMag meets and exceeds expectations.
Design & Ergonomics
The EndoMag insert is constructed from a durable, lightweight polymer material. The weight is negligible compared to the overall weight of a loaded PMAG. The design is simple and functional, requiring no modifications to the host PMAG.
The installation process is straightforward, but users should ensure proper seating and retention within the PMAG. No significant learning curve is present.
Durability & Maintenance
Based on my experience, the EndoMag insert appears durable enough to withstand thousands of rounds. Regular cleaning and inspection for wear or damage will further extend its lifespan. The modular nature of the system means that individual components, such as the spring, can be replaced if needed.
Disassembly for cleaning and maintenance is relatively simple, requiring no specialized tools. The robust construction contributes to its longevity and reliability.
Accessories and Customization Options
The Mean Arms EndoMag 9mm Magazine Ejectorless CMMG Version 3-Pack is primarily designed to work within existing PMAGs, inheriting all the customization options associated with them. This includes the use of PMAG Ranger Plates for improved grip and handling, as well as PMAG couplers for joining magazines together. Caliber marking tools/stencils are great for clearly indicating which PMAGs are dedicated for 9mm use.
The EndoMag is inherently compatible with any AR-15 lower receiver designed to accept standard PMAGs. The system allows existing AR-15 users to leverage their existing investment in PMAGs, improving value and versatility.
Pros and Cons of Mean Arms EndoMag 9mm Magazine Ejectorless CMMG Version 3-Pack
Pros
- Affordable conversion: Significantly cheaper than buying dedicated 9mm AR magazines or a complete 9mm lower.
- Utilizes existing PMAGs: Keeps your gear consistent and saves you from buying new magazines.
- Easy to install: Drops into PMAGs without any permanent modifications.
- Reliable feeding (post break-in): Once broken in, the EndoMag delivers consistent performance.
- Maintains AR-15 muscle memory: Keeps reload drills consistent between 5.56 and 9mm platforms.
Cons
- Potential break-in period: Some inserts may require 20-50 rounds to achieve optimal reliability.
- Requires CMMG Radial Delayed Blowback system: Not compatible with standard blowback 9mm AR-15 builds.
Who Should Buy Mean Arms EndoMag 9mm Magazine Ejectorless CMMG Version 3-Pack?
The Mean Arms EndoMag 9mm Magazine Ejectorless CMMG Version 3-Pack is perfect for AR-15 owners with CMMG Radial Delayed Blowback systems who want to easily and affordably convert their platform to 9mm. Competitive shooters who want consistent reload drills across calibers can also benefit from using their existing PMAGs.
Those using standard blowback 9mm AR-15 systems should skip this product as it requires the CMMG delayed blowback bolt. A must-have accessory is a dedicated PMAG for each EndoMag insert to streamline caliber changes.
Conclusion on Mean Arms EndoMag 9mm Magazine Ejectorless CMMG Version 3-Pack
The Mean Arms EndoMag 9mm Magazine Ejectorless CMMG Version 3-Pack offers an ingenious and cost-effective solution for converting a standard AR-15 lower receiver to 9mm. Although a slight break-in period might be needed, the overall reliability, ease of use, and ability to utilize existing PMAGs make this a worthwhile investment. At $79.99 for a 3-pack, the value proposition is excellent.
I wholeheartedly recommend the EndoMag system to anyone with a CMMG Radial Delayed Blowback 9mm upper receiver. Transform your AR-15 platform with this simple and effective solution.