Below are the best Holosun Optics for your FNH FNX-45 Tactical. These will mount directly to the RMR plate included with your FNX-45 Tactical. We also have some adapter plates listed below if you decide to purchase the Holosun 509T. This will let you use one plate instead of two.

If you have any questions reach out to us on chat! We also have this FNX-45 Tactical Optics Fitment Guide which you may find helpful.