PROMAG FN 509 MAGAZINE - 9MM - 10 ROUND CAPACITY - 50 ROUND BODY - POLYMER - BLACK

ProMag Industries
MPN:
DRM-A84
UPC:
708279015649
$100.69 - $110.69
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The ProMag FN 509 10/50 Drum Magazine delivers the high-capacity look and feel of a 50-round drum body while remaining fully compliant with California's 10-round magazine limit — giving FN 509 owners a bold, reliable feeding solution built right here in the USA.

  • California-compliant 10-round capacity housed in a 50-round drum body
  • Fits the FN 509 series chambered in 9mm Luger
  • Heat-treated steel drum body finished in durable black oxide coating
  • Precision-wound chrome silicon magazine spring resists fatigue over time
  • Injection-molded polymer follower ensures smooth, consistent round feeding
  • Made in the USA and backed by ProMag's lifetime manufacturer defect guarantee

Who This Is For

This magazine is ideal for FN 509 owners in California and other restricted states who want the aggressive aesthetic of a drum magazine without sacrificing legal compliance. It's a great choice for range shooters, competitive shooters, and collectors who appreciate American-made quality and the distinctive look of the 50-round drum profile on their pistol.

ProMag FN 509 9mm 10-round capacity 50-round drum magazine in black polymer and steel

Specifications

BrandProMag Industries
Compatible FirearmFN 509 (9mm)
Caliber9mm Luger
Capacity10 Rounds (California Compliant)
Body Style50-Round Drum Profile
Body MaterialHeat-Treated Steel
FinishBlack Oxide
Follower MaterialInjection-Molded Polymer
Spring MaterialHeat-Treated Chrome Silicon Wire
ColorBlack
Country of OriginUSA
WarrantyLifetime (Manufacturer Defects)

Frequently Asked Questions

Is this magazine truly limited to 10 rounds, or can it be modified to hold more?

This magazine is manufactured and blocked at the factory to hold a maximum of 10 rounds, making it legal for sale and use in California and other states with magazine capacity restrictions. It is not designed or intended to be converted to a higher capacity, and attempting to modify it would be illegal in restricted states and would void the ProMag lifetime warranty.

Which FN 509 models is this magazine compatible with?

This ProMag drum magazine is designed specifically for the FN 509 pistol platform chambered in 9mm Luger. This includes standard FN 509 variants. If you own a different FN model or caliber, verify compatibility before purchasing, as magazine fitment can vary between firearm families.

How reliable is the ProMag drum magazine for range use, and how should I maintain it?

ProMag magazines are assembled with precision-wound chrome silicon springs and inspected at every stage of production for consistent feeding reliability. For best performance, avoid leaving the magazine fully loaded for extended periods, as this can stress the spring over time. Periodically disassemble, clean, and lightly lubricate the internals to keep feeding smooth and reliable during range sessions.

Caliber:
9mm
Capacity:
10/50 Round
Color:
Black
Follower Color:
Black
Type:
Pistol Magazine
CA Compliant:
Yes
Platform:
509
Material:
Polymer