First Impressions of ProMag Polymer Smith & Wesson SD40 .40 S&W 50-Round Pistol Magazine
The ProMag Polymer Smith & Wesson SD40 .40 S&W 50-Round Pistol Magazine is a high-capacity magazine designed to drastically increase the firepower of the popular Smith & Wesson SD40 pistol. This aftermarket magazine promises to turn a reliable sidearm into a formidable tool for range days, competition, or even a SHTF scenario.
My interest in this magazine stemmed from a desire to extend range time and reduce the frequency of reloads during training sessions. Spending less time reloading means more time focused on fundamentals, target acquisition, and improving overall proficiency.
Upon receiving the magazine, the first thing I noticed was its length. It’s significantly longer than the standard SD40 magazine, which is to be expected given its 50-round capacity. The polymer construction feels robust, although noticeably lighter than a comparable steel magazine of similar capacity would likely be. I was cautiously optimistic, having had mixed experiences with aftermarket magazines in the past, but the ProMag name carries a certain level of recognition, so I went in hoping for the best.
Compared to standard 14-round magazines and even a couple of extended 22-rounders I’ve used, the ProMag aims for maximum capacity. I chose this over stacking multiple standard magazines because I wanted something that would allow me to get a lot of shots in without having to reload as frequently. My first impression was one of intrigue mixed with a healthy dose of skepticism – could this magazine actually deliver on its promise without compromising reliability?
Real-World Testing: Putting ProMag Polymer Smith & Wesson SD40 .40 S&W 50-Round Pistol Magazine to the Test
First Use Experience
My initial testing ground for the ProMag Polymer Smith & Wesson SD40 .40 S&W 50-Round Pistol Magazine was my local outdoor shooting range. The weather was cooperative, with clear skies and a slight breeze, providing optimal conditions for evaluating performance.
I ran several drills, focusing on rapid target acquisition and controlled pairs, to see how the added weight and length affected handling. The magazine functioned well for the first 30 rounds, but then I encountered a couple of failures to feed, where the slide failed to fully chamber a round. This was concerning, but I decided to continue testing after clearing the malfunctions, making sure to thoroughly inspect and clean the magazine after that first outing.
Extended Use & Reliability
After several weeks and hundreds of rounds, the ProMag showed a pattern of intermittent reliability. About every third or fourth full magazine resulted in one or two failures to feed. While not a constant issue, this inconsistency is a significant concern for any serious application.
Visually, the polymer magazine body has held up well, with no signs of cracking or significant wear. Cleaning the magazine is fairly straightforward, although disassembling it for a more thorough cleaning can be a bit fiddly. Compared to my standard Smith & Wesson magazines, the ProMag requires more frequent cleaning to maintain acceptable reliability. While the increased capacity is nice, I wouldn’t take it out with me on duty or in a life-threatening situation.
Breaking Down the Features of ProMag Polymer Smith & Wesson SD40 .40 S&W 50-Round Pistol Magazine
Specifications
The ProMag Polymer Smith & Wesson SD40 .40 S&W 50-Round Pistol Magazine is specifically designed for the Smith & Wesson SD40 pistol chambered in .40 S&W. It boasts a 50-round capacity, significantly increasing the pistol’s firepower.
The magazine body is constructed from a proprietary DuPont Zytel based polymer, offering a balance of durability and weight reduction. The follower is injection molded, ensuring consistent feeding, while the magazine spring is formed from heat treated chrome silicon wire, designed for long-lasting performance and resistance to fatigue. These specs matter because magazine reliability is paramount to any semi-automatic firearm.
Performance & Functionality
The ProMag Polymer Smith & Wesson SD40 .40 S&W 50-Round Pistol Magazine delivers on its promise of increased capacity, however, the inconsistency in reliability is an issue. While it generally functions well, the occasional failures to feed detract from its overall performance.
The magazine’s main strength is obviously the ability to fire 50 rounds without reloading; a significant advantage in certain scenarios. The primary weakness is the unpredictable feeding issues that occur periodically. While the magazine meets its capacity claim, it falls short of exceeding expectations due to the reliability concerns.
Design & Ergonomics
The polymer construction keeps the weight manageable, even when fully loaded. The magazine’s length, however, does affect the pistol’s balance and handling, especially during rapid movements or transitions.
The magazine fits securely into the SD40’s magazine well, with no excessive play or movement. There is a slight learning curve associated with reloading, as the extended length requires a different grip and insertion technique.
Durability & Maintenance
The DuPont Zytel based polymer construction appears to be durable, showing no signs of cracking or deformation after repeated use. Regular cleaning is essential to maintain optimal performance, particularly the magazine spring and follower.
Disassembly for cleaning is relatively simple, but requires some familiarity with magazine construction. With proper care, the magazine should provide a reasonable service life.
Accessories and Customization Options
The ProMag Polymer Smith & Wesson SD40 .40 S&W 50-Round Pistol Magazine does not offer any additional accessories or customization options beyond its standard configuration. It is designed to function as a direct replacement for the factory magazine, albeit with a significantly increased capacity.
Compatibility with aftermarket baseplates or extensions is limited, as the magazine’s design is specific to its 50-round capacity. While you can use standard magazine loaders, the high capacity makes loading by hand tedious.
Pros and Cons of ProMag Polymer Smith & Wesson SD40 .40 S&W 50-Round Pistol Magazine
Pros
- Significantly increased capacity: 50 rounds provide a distinct advantage in situations where high firepower is needed.
- Durable polymer construction: The DuPont Zytel polymer is lightweight yet resilient, offering long-lasting performance.
- Easy to load: Despite the high capacity, the magazine is relatively easy to load with a standard magazine loader.
- Direct replacement: Drops right into the SD40’s magazine well.
Cons
- Inconsistent reliability: Failures to feed occur intermittently, making it unsuitable for duty or self-defense purposes.
- Extended length: Affects pistol balance and handling.
Who Should Buy ProMag Polymer Smith & Wesson SD40 .40 S&W 50-Round Pistol Magazine?
The ProMag Polymer Smith & Wesson SD40 .40 S&W 50-Round Pistol Magazine is perfect for range shooters who want to spend less time reloading and more time practicing. Competitive shooters participating in events where high capacity magazines are allowed may also find it useful, provided they address the reliability concerns.
Those who rely on their SD40 for self-defense or duty use should skip this product. The magazine’s intermittent reliability issues make it unsuitable for situations where consistent performance is critical.
A must-have accessory for this magazine is a high-quality magazine loader to ease the loading process. Thorough cleaning and lubrication are also essential to maintain optimal performance and potentially mitigate some of the reliability issues.
Conclusion on ProMag Polymer Smith & Wesson SD40 .40 S&W 50-Round Pistol Magazine
The ProMag Polymer Smith & Wesson SD40 .40 S&W 50-Round Pistol Magazine offers a tempting proposition: a substantial increase in firepower for the popular SD40 pistol. While the magazine delivers on its capacity claim and features a durable polymer construction, the intermittent reliability issues are a significant drawback.
At a price of $95.59, the value proposition is questionable. While the increased capacity is appealing, the potential for malfunctions undermines its usefulness in critical situations.
Personally, I would recommend this magazine only for range use, and with the caveat that it may not be 100% reliable. If you prioritize maximum firepower and are willing to accept occasional malfunctions, the ProMag may be worth considering. However, for duty or self-defense purposes, sticking with factory magazines or more reliable aftermarket options is a safer bet. Before buying, consider what is most important for you when purchasing magazines.