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It does not directly fit but the necessary adapter plate is included.
Hi Richard and welcome. No, you would need a RMS/RMSc Optics Plate for the 507K. The 507c is the RMR footprint Red/Green Dot. Cheers, stay safe and enjoy! https://chpws.com/product/fnx-adapter-plates-various-rds/
Hi Richard, James is correct, the 507C would be a fit, but you need a RMS/RMSc Optics Plate for the 507K. The FNX-45 Tactical comes with an optics ready slide and ships with two plates. One plate is a Doctor Cut which would fit a Burris FastFire 3 and the other plate is an RMR plate which would fit Trijicon RMR and some, not all, Holosun sights. Stay safe & have a great day!