When upgrading a duty or range kit, a dependable spare magazine is one of the simplest, highest-value additions you can make. A steel replacement magazine that fits cleanly and feeds reliably reduces stoppages, speeds reloads, and keeps a backup supply of ammunition ready when it matters most.
PROMAG S&W M&P 40 is a steel replacement or extra magazine designed specifically for the Smith Wesson MP chambered in 40 caliber. 
Overview and Fit
This PROMAG S&W M&P 40 magazine is built to serve as either a full-time replacement or an extra mag for shooters who run a Smith & Wesson M&P in .40 caliber. Its steel construction provides a sturdy alternative to polymer magazines, offering resistance to deformation and a predictable feed angle for common .40 S&W loads. Priced at $20.99, it’s an economical way to expand capacity and redundancy without compromising basic reliability.
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Shop this product to add a durable spare to your kit; clicking the link will take you to the shop page where you can purchase through the retailer.
Design, Materials, and Brand Notes
Promag has long produced aftermarket magazines and accessories for common service pistols. This model’s steel body resists wear from holstering and repeated loading cycles. The magazine is specified for the Smith Wesson MP platform chambered in .40, so check fit against your exact model variant—Promag lists compatibility across various M&P models.
Why .40 caliber?
The .40 S&W offers a balance of stopping power and controllability for defensive and duty applications. For shooters carrying an M&P in .40, using a magazine designed specifically for that chambering helps ensure proper feed geometry and reliable function with common defensive and training rounds.
Field Use and Maintenance
In day-to-day use, steel magazines like this one benefit from routine inspection: check for feed-lip deformation, clean the follower and spring periodically, and replace springs after heavy cycling. For range training, keep several magazines on hand to practice reloads and malfunction drills. For purchase details and current stock, View product details and pricing on the shop page.
For a straightforward, budget-friendly magazine upgrade for your Smith Wesson M&P in .40 caliber, this PROMAG S&W M&P 40 offers steel construction and practical compatibility at $20.99. Check current availability and complete your purchase by following the link to the shop page where the retailer provides checkout options. Check availability
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People Also Ask
What makes this product stand out from competitors?
This product offers superior quality and innovative features that set it apart in the market. Its design focuses on both performance and reliability, making it a top choice for professionals and enthusiasts alike.
Is this product suitable for beginners?
Yes, this product is designed with user-friendly features that make it accessible to beginners while still offering advanced capabilities for experienced users.
What warranty or support is available?
The product comes with comprehensive warranty coverage and excellent customer support to ensure your satisfaction and peace of mind.
How does this compare to similar products in its price range?
This product offers exceptional value for its price point, providing features and quality that typically cost significantly more in comparable alternatives.
What maintenance is required?
Minimal maintenance is required thanks to the product’s durable construction and quality materials. Regular cleaning and occasional inspections will keep it performing optimally.
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