Mossberg 590M Double Stack 12 Gauge 20 Round Shotgun Magazine Review

First Impressions of Mossberg 590M Double Stack 12 Gauge 20 Round Shotgun Magazine

The Mossberg 590M Double Stack 12 Gauge 20 Round Shotgun Magazine promises a significant leap in firepower for the Mossberg 590M platform. This magazine aims to transform the venerable 590M into a true high-capacity, mag-fed beast. The key feature grabbing everyone’s attention is, of course, its massive 20-round capacity, offering a substantial advantage in situations demanding serious firepower.

I had been searching for a way to increase the capacity of my 590M for home defense and range use, and this magazine seemed like the perfect solution. Factory 5 or 10 round magazines simply did not provide the capacity necessary for multi-gun competitions. I was also seeking something more reliable than some of the aftermarket drum magazines that exist for other platforms.

Upon receiving the Mossberg 590M Double Stack 12 Gauge 20 Round Shotgun Magazine, my initial impression was one of robust construction. The polymer body felt incredibly sturdy, and the steel feed lips exuded confidence. Compared to the standard capacity magazines, this one felt significantly beefier.

I considered other options, like purchasing multiple smaller capacity magazines, or even trying to adapt other shotgun magazines. However, the dedicated design of the Mossberg 590M Double Stack 12 Gauge 20 Round Shotgun Magazine, combined with the Mossberg name, gave me more confidence. My first impression was a positive surprise – this magazine looked and felt like it was built to handle serious use.

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Real-World Testing: Putting Mossberg 590M Double Stack 12 Gauge 20 Round Shotgun Magazine to the Test

First Use Experience

I first tested the Mossberg 590M Double Stack 12 Gauge 20 Round Shotgun Magazine at my local outdoor shooting range. The weather was clear and sunny, providing ideal conditions for testing. I loaded the magazine with a variety of 2.75-inch shotshells, from birdshot to buckshot, to assess its performance across different loads.

The initial loading process was a bit stiff, but manageable, especially after the first few rounds. The magazine fed reliably for the first several rounds. However, around round 15, I experienced a couple of failures to feed, which was unexpected.

After the first use, I found I needed to really seat the magazine firmly, which took some practice. Overall, it was mostly positive. I’d say the overall ease of use was acceptable, although a little different than loading standard shotgun tubes.

Extended Use & Reliability

After several weeks of use and approximately 300 rounds fired, the Mossberg 590M Double Stack 12 Gauge 20 Round Shotgun Magazine has become more reliable, but still requires attention. I’ve noticed that keeping the magazine meticulously clean is crucial for consistent feeding. Any grit or debris can cause malfunctions.

There are a few minor scuffs on the polymer body, but nothing that affects performance. The steel feed lips show no signs of wear. Maintenance is straightforward, requiring only a quick wipe-down after each range session and a more thorough cleaning every few hundred rounds.

While it doesn’t outperform the factory 5 or 10-round magazines in terms of absolute reliability, the increased capacity offers a significant advantage. This requires a little more diligence to ensure consistent operation. It has definitely changed the way I use my 590M for range practice and drills.

Breaking Down the Features of Mossberg 590M Double Stack 12 Gauge 20 Round Shotgun Magazine

Specifications

• The Mossberg 590M Double Stack 12 Gauge 20 Round Shotgun Magazine is designed exclusively for 2.75-inch shotshells. This limitation should be carefully considered, as it will not function with larger 3-inch shells.
• The magazine boasts a patented double-stack design to maximize its 20-round capacity. This is a key feature enabling such a high round count in a relatively compact package.
• It is compatible only with the Mossberg 590M Mag-Fed Shotgun. Compatibility is not universal, so it’s crucial to own the correct firearm.
• The magazine body is constructed from a proprietary self-lubricating polymer material. This material is designed for durability and smooth feeding, even under harsh conditions.
• Hardened steel feed lips ensure reliable shell presentation. These feed lips are critical for consistent cycling and resisting deformation over time.
• It features an easy-grip molded design for secure handling and quick magazine changes. This is especially important in high-stress situations.
• The removable floor plate allows for easy cleaning and maintenance. A clean magazine is a reliable magazine.
• Steel components feature a tough black oxide finish for corrosion resistance. This finish protects against rust and wear, extending the magazine’s lifespan.

Performance & Functionality

The Mossberg 590M Double Stack 12 Gauge 20 Round Shotgun Magazine’s primary function is to provide a high-capacity feeding solution for the 590M shotgun. When clean and properly maintained, it mostly delivers on this promise, offering a significant increase in firepower. The reliability, however, is slightly less than smaller capacity magazines, with occasional failures to feed occurring, particularly when the magazine is heavily loaded or dirty.

Its strength lies in its ability to deliver a large volume of shots quickly. The weakness is its sensitivity to cleanliness and the need for firm magazine seating. Overall, it mostly meets expectations for a high-capacity magazine, but requires more attention than standard magazines.

Design & Ergonomics

The build quality is impressive, with a robust polymer body and sturdy steel feed lips. While durable, the magazine’s large size can make it somewhat bulky to carry and manipulate. The easy-grip molded design helps with handling, but the sheer weight of a fully loaded 20-round magazine can still be significant.

There is a learning curve associated with loading and seating the magazine properly. New users may need some practice to ensure reliable feeding. The ergonomics are acceptable, but the large size is a trade-off for the increased capacity.

Durability & Maintenance

With proper care, this magazine should last for thousands of rounds. The polymer body is resistant to impacts and abrasion, while the steel feed lips are designed to withstand repeated use. Regular cleaning is essential to maintain optimal performance.

The removable floor plate simplifies maintenance, allowing for easy access to the magazine’s interior. With a little diligence, the magazine can be kept in good working order for an extended period.

Accessories and Customization Options

The Mossberg 590M Double Stack 12 Gauge 20 Round Shotgun Magazine does not come with any included accessories beyond the magazine itself. There are no customization options directly related to the magazine. The magazine is intended to work as a standalone unit.

It’s compatible with the Mossberg 590M Mag-Fed Shotgun, which has its own range of accessories, such as different stocks, forends, and sights. However, compatibility with third-party accessories for the magazine itself is limited. The focus is on using the magazine as designed, without modification.

Pros and Cons of Mossberg 590M Double Stack 12 Gauge 20 Round Shotgun Magazine

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Who Should Buy Mossberg 590M Double Stack 12 Gauge 20 Round Shotgun Magazine?

This magazine is perfect for competitive shooters participating in multi-gun competitions where high capacity is advantageous. It is also well-suited for home defense scenarios where maximum firepower is desired. Additionally, range enthusiasts who enjoy extended shooting sessions will appreciate the reduced need for reloading.

Those who prioritize absolute reliability above all else should proceed with caution. Shooters who are unwilling to perform regular maintenance or those who primarily use 3-inch shells should skip this product.

A must-have accessory is a reliable magazine pouch for easy carrying and quick access. It is also beneficial to have a cleaning kit specifically designed for shotgun magazines.

Conclusion on Mossberg 590M Double Stack 12 Gauge 20 Round Shotgun Magazine

The Mossberg 590M Double Stack 12 Gauge 20 Round Shotgun Magazine is a worthwhile addition for owners of the Mossberg 590M Mag-Fed Shotgun seeking increased firepower. While it requires more attention to cleaning and seating than smaller magazines, the sheer capacity is a significant advantage in many situations. The robust construction and Mossberg name inspire confidence in its durability.

At $134.79, the price is justified for those who truly need the extra capacity. The cost balances out if you consider the value of fewer reloads and increased shooting time.

I would recommend this magazine to experienced shotgun users who understand the importance of proper maintenance and technique. If you’re willing to put in the effort to keep it clean and seat it firmly, the Mossberg 590M Double Stack 12 Gauge 20 Round Shotgun Magazine can transform your 590M into a formidable firearm. Consider this magazine and unlock the true potential of your Mossberg 590M!