The FNX-45 comes standard with either a 15-round or 10-round magazine.
FN FNX-45 Magazines
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Frequently asked questions about FN FNX-45 Magazines
What is the standard magazine capacity of the FNX-45?
Which magazines fit the FNX-45?
There is a factory 10 and 15-round magazine, as well as an extended 20-round magazine from ProMag, available to choose from.
Can I use my FNX-40 magazine in my FNX-45?
No, you must use a designed FNX-45 magazine.