For Sig MPX owners seeking extended capacity without sacrificing reliability, selecting the right magazine can change how you prepare for range days, training, and defensive scenarios. A drum magazine that feeds cleanly and fits the platform well turns a standard setup into a high-capacity system ready for sustained drills.
PROMAG MPX 50RD is a 9mm Luger, 50-round drum magazine designed specifically for the Sig MPX and manufactured in the USA. 
Design and fit: What to expect
The PROMAG MPX 50RD is built for the Sig MPX platform and engineered for the 9mm Luger cartridge. Promag’s approach focuses on capacity and straightforward installation: the drum provides a 50-round increase over standard magazines while maintaining a compact profile relative to other high-capacity solutions. As a domestically produced component, it carries the advantage of U.S. manufacturing standards and replacement parts support tied to the Promag brand.
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Shop this product to confirm fit for your MPX variant and to view current stock at our shop page.
Performance: 9mm Luger advantages
9mm Luger remains a versatile defensive and training caliber thanks to manageable recoil, wide ammunition availability, and proven terminal performance with modern defensive loads. Using a reliable 50-round drum like this one helps reduce reload frequency during drills, allowing shooters to focus on marksmanship and movement. Promag’s design emphasizes consistent feeding for the 9mm Luger, which is critical for run-and-gun drills and extended-range sessions.
Installation and handling tips
Install the PROMAG MPX 50RD just as you would a standard MPX magazine: ensure the feed lips align, lock the mag into the well, and perform a function check. For first-time use, run several dummy rounds through the system to verify seating and feeding. Keep cleaning simple: periodic external wipe-down and inspection for debris will maintain reliable operation.
View product details and pricing — the PROMAG MPX 50RD is listed at $90.99 on our product page.
Whether you’re optimizing a training regimen or configuring a defensive package, the PROMAG MPX 50RD delivers a practical balance of capacity, platform compatibility, and domestic manufacturing at an accessible price. Check current availability on our shop page to purchase and confirm compatibility with your MPX model.
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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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