First Impressions of ProMag Polymer Steel Sig Sauer P320 9mm 21-Round Pistol Magazine
The ProMag Polymer Steel Sig Sauer P320 9mm 21-Round Pistol Magazine promises to deliver increased capacity and reliable performance at a significantly lower price point than factory magazines. As a seasoned shooter and gear enthusiast, I was naturally skeptical but also intrigued by the potential cost savings. The prospect of having more rounds at my disposal without breaking the bank was definitely appealing.
I’ve always been on the lookout for high-capacity magazines for my Sig P320. Factory Sig Sauer magazines are notoriously expensive, and I’ve always felt limited by the standard 17-round capacity during training and competitions. The ProMag offered a potential solution to this problem.
Upon receiving the magazine, my initial impression was one of cautious optimism. The polymer body felt sturdy enough, though not quite as robust as the all-metal factory mags. The steel lining gave me some reassurance, but I was eager to test its performance in the field.
I have used Mec-Gar magazines in the past, and they’ve generally proven to be reliable, albeit at a slightly higher price than ProMag. ETS magazines, with their clear polymer construction, also crossed my mind, but I’ve heard mixed reviews regarding their long-term durability. Ultimately, the price point and the promise of steel reinforcement swayed me towards the ProMag Polymer Steel Sig Sauer P320 9mm 21-Round Pistol Magazine.
Initially, I was both excited and apprehensive. The price was right, but I’ve learned over the years that cheaper isn’t always better, especially when it comes to critical components like magazines. I was ready to put it through its paces and see if it could truly deliver on its promise.
Real-World Testing: Putting ProMag Polymer Steel Sig Sauer P320 9mm 21-Round Pistol Magazine to the Test
First Use Experience
I first tested the ProMag Polymer Steel Sig Sauer P320 9mm 21-Round Pistol Magazine at my local outdoor shooting range. I put it through several drills, practicing reloads, malfunction clearances, and rapid-fire sequences. I wanted to simulate real-world conditions as closely as possible.
The magazine performed adequately in relatively dry conditions. Loading was a bit stiff, particularly towards the last few rounds, as the user feedback suggested, but manageable. There were no immediate malfunctions or failures to feed during the first few magazines.
Extended Use & Reliability
After several weeks of consistent use, I began to notice some inconsistencies in performance. The ProMag Polymer Steel Sig Sauer P320 9mm 21-Round Pistol Magazine proved less reliable than factory Sig Sauer magazines. I experienced several failures to feed, particularly when the magazine was fully loaded or when shooting from unconventional positions.
After about 500 rounds, the polymer body began to show some wear around the feed lips. The finish started to chip off in certain areas, indicating that the magazine might not hold up well to long-term abuse. The spring tension also seemed to weaken slightly over time, making loading a bit easier but potentially contributing to the feeding issues.
While cleaning was straightforward, I noticed that the polymer material was more susceptible to scratching than the metal bodies of my factory magazines. It’s not a major concern, but it suggests a lower level of overall durability. In comparison to my factory Sig magazines, the ProMag falls short in terms of consistent performance and long-term reliability. While the price is attractive, the occasional malfunctions make it less suitable for duty or self-defense use in my opinion.
Breaking Down the Features of ProMag Polymer Steel Sig Sauer P320 9mm 21-Round Pistol Magazine
Specifications
The ProMag Polymer Steel Sig Sauer P320 9mm 21-Round Pistol Magazine is designed for use with Sig Sauer P320 pistols chambered in 9mm Luger. Its magazine body is constructed from a DuPont Zytel based polymer, offering a lightweight yet reasonably durable housing.
The magazine features a 21-round capacity, significantly increasing the firepower compared to standard 17-round magazines. An injection-molded follower and a heat-treated chrome silicon wire spring are used to ensure reliable feeding. The Manufacturer is ProMag.
These specifications translate to a higher round count and potentially faster reloads in competitive or tactical scenarios. The polymer construction reduces weight, but the steel lining is intended to enhance durability and prevent deformation. The magazine capacity is what draws most users to the product, offering a tangible advantage in situations where more rounds are needed.
Performance & Functionality
The primary function of the ProMag Polymer Steel Sig Sauer P320 9mm 21-Round Pistol Magazine is to reliably feed 9mm rounds into a Sig P320 pistol. When it works, it works well, providing a smooth and consistent feed cycle. However, I encountered some reliability issues, especially with fully loaded magazines, which did detract from the overall user experience.
The magazine’s biggest strength is its increased capacity. A significant weakness is the occasional failure to feed. It meets expectations in terms of round count, but falls short in terms of unwavering reliability compared to factory magazines.
Design & Ergonomics
The ProMag Polymer Steel Sig Sauer P320 9mm 21-Round Pistol Magazine features a polymer body with steel reinforcements, offering a balance between weight and durability. The weight is comparable to a factory magazine, and it fits snugly into the magazine well of my Sig P320.
The design is straightforward and functional, with a standard magazine release cutout. There’s a slight learning curve associated with loading the magazine to full capacity, as the spring tension is quite strong initially. It’s mostly user-friendly.
Durability & Maintenance
Based on my experience, the ProMag Polymer Steel Sig Sauer P320 9mm 21-Round Pistol Magazine should last for a reasonable amount of time with proper care and maintenance. However, it’s unlikely to withstand the same level of abuse as a metal magazine.
Cleaning is easy, as the magazine disassembles quickly for thorough cleaning. Replacement springs and followers are also available, extending its lifespan if needed.
Accessories and Customization Options
The ProMag Polymer Steel Sig Sauer P320 9mm 21-Round Pistol Magazine doesn’t come with any additional accessories. No customization options are available directly.
It is generally compatible with standard Sig Sauer P320 magazine pouches and loaders. It is not compatible with aftermarket baseplates.
Pros and Cons of ProMag Polymer Steel Sig Sauer P320 9mm 21-Round Pistol Magazine
Pros
- Increased 21-round capacity provides a significant firepower advantage.
- ProMag‘s Lower price point makes it a more budget-friendly option compared to factory magazines.
- The steel-reinforced polymer body offers a decent balance between weight and durability.
- Disassembly is simple, making cleaning and maintenance easy.
- Compatible with most standard Sig Sauer P320 magazine pouches and loaders.
Cons
- Less reliable than factory Sig Sauer magazines, with occasional failures to feed.
- Polymer body is more susceptible to wear and tear compared to metal magazines.
Who Should Buy ProMag Polymer Steel Sig Sauer P320 9mm 21-Round Pistol Magazine?
The ProMag Polymer Steel Sig Sauer P320 9mm 21-Round Pistol Magazine is perfect for recreational shooters and range enthusiasts looking for a cost-effective way to increase their magazine capacity. It is also suitable for those who are willing to accept a slight compromise in reliability for the sake of affordability.
Those who rely on their firearms for self-defense or duty use should probably skip this product. The increased capacity is nice, but consistent reliability is paramount in critical situations. Factory magazines, while more expensive, offer a greater degree of assurance in terms of performance.
A magazine loader would be a must-have accessory for anyone purchasing this product. The stiff spring makes loading to full capacity challenging without assistance.
Conclusion on ProMag Polymer Steel Sig Sauer P320 9mm 21-Round Pistol Magazine
The ProMag Polymer Steel Sig Sauer P320 9mm 21-Round Pistol Magazine offers an appealing combination of increased capacity and affordability. However, the occasional reliability issues prevent it from being a truly outstanding product. It isn’t a perfect product.
The price is certainly justified for range use and recreational shooting. For serious applications, I would personally recommend investing in factory Sig Sauer magazines.
Overall, the ProMag Polymer Steel Sig Sauer P320 9mm 21-Round Pistol Magazine is a decent option for shooters on a budget. If you value round count over guaranteed reliability, it’s worth considering.