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FN offers a 24-round magazine, which offers the largest capacity for a FN 509.
FN 509 Magazines
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Frequently asked questions about FN 509 magazines
What is the largest capacity factory magazine available for the FN 509?
Are the FN 509 CC Edge magazines compatible with the standard FN 509?
Yes, the 509 CC Edge magazines are compatible with other 509 models, capacity and frame size permitting.
Are there reliable aftermarket magazines available for the FN 509?
Yes, ProMag manufacturers reliable magazines for the FN 509, including a 50-round drum magazine!