ProMag Industries 50 Round 9mm Drum Magazine - SIG MPX

Manufactured by ProMag Industries
Manufactured by ProMag Industries
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$69.99 $99.99

In Stock

Standard orders will ship out in 1 business day (M-F) if ordered by 3:30 pm CST. FFL orders will ship within 5 business days or less as long as we have the information for the transfer destination. NFA items will take longer to ship and are dependent upon ATF processing times.

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Magazines considered High Capacity are controlled by the ATF and/or local jurisdictions are not available for purchase/shipment in all areas.



ProMag drum magazines are an affordable way to increase the capacity of your Sig MPX for those long days plinking at the range. The DRM-A21 is a 50 round drum magazine designed for 9mm ammunition and Sig MPX handguns. It is made from a durable Dupont Zytel based polymer for durability. This ProMag drum magazine uses a winding mechanism on the front to reduce or increase follower spring tension whether you are loading ammunition or shooting it. This 50 round 9mm drum magazine is a great option for those at the range who don’t want to constantly stop to reload.

  • Durable polymer construction
  • 50 round capacity of 9mm
  • Front winding spring to reduce and increase follower tension
ProMag Industries is dedicated to the quality that goes into their magazines and accessories. Dependability isn’t taken for granted. It’s built in.
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BrandProMag Industries
Caliber Gauge9mm Luger
Magazine Capacity50
PlatformSIG Sauer Handguns
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to

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