While the 509 family of magazines is made to be interchangeable, fitment will depend on grip length and the use of magazine sleeves. Be sure to check our detailed descriptions to confirm compatibility before purchasing!
FN 509M Magazines
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Frequently Asked Questions
Can I use my FN 509M magazines in other 509 models?
What is the highest capacity factory magazine that fits the FN 509M?
We carry a 24-round factory magazine that comes with various-sized grip sleeves to accommodate multiple 509 models, including the 509M.