ProMag Sig MPX 9mm 30 Round Drum Magazine PMDRMA36

The ProMag Sig MPX 9mm 30-Round Drum Magazine is built for shooters who need high capacity and dependable performance without compromise. Its robust drum body is molded from a proprietary DuPont™ Zytel®-based polymer that stands up to drops, impacts, and rough handling while keeping the unit light enough for practical use. The drum’s upper housing is a heat-treated stamped steel assembly with a black oxide finish that protects the critical feed lips and mating surfaces from premature wear, and an injection-molded follower keeps rounds aligned for smooth, consistent feeding. Proudly made in the USA, this magazine brings domestic manufacturing standards and ProMag’s long track record into a package you can trust.

Performance is engineered into the internals. The spring is a heat-treated stainless steel wire designed to hold consistent pressure over thousands of cycles, reducing the chance of stovepipes or misfeeds when you need reliability most. The magazine’s feed geometry and internal finish are optimized to work with the Sig MPX platform, so you’ll get repeatable lockups and indexing when you cycle through drills or run sustained strings. Aggressive external texturing on the polymer drum gives you a positive gripping surface for quick swaps, and the unit’s dimensions are tuned to minimize interference with common MPX chassis and handguards.
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Maintenance and longevity were part of the design brief. The drum disassembles for routine cleaning and inspection; parts like the follower and spring are serviceable and backed by ProMag’s warranty, so you’re not left replacing the whole assembly over routine wear. That practicality makes this drum an attractive option for range work, extended training sessions, or when you want the ease of higher capacity without stepping up to heavier, more complex systems. Fitment is straightforward — it’s made to drop into Sig MPX pistols and carbines with minimal fuss, giving shooters a simple, honest way to extend capacity while keeping function front and center.
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