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Apex tactical makes an adapter plate for the FN509 tactical for the Aimpoint ARCO.
The ACRO will have mounting plates for Glock, Sig, FN, etc. They run about $50. However, I believe the FN 509 tactical mounting plate hasn’t been released yet. There will be one though. Aimpoint used an FN tac at Shot Show. There will be plates for all the major optic ready pistols.
I don't see any mounts for FN for sale yet as preorder on any sites but if I recall correctly I saw a video where at shot show they confirmed that FN was one of the models they would initially support. Dunno if they meant all FN or maybe just the FNX/P Tactical series if the 509 is a different cut. They could all be the same though so I would say we will see for sure soon enough when they are listed.
Yes, but you need to buy the mounting plate ($50) that is specific for your gun. Aimpoint is making them for all the major optic ready pistols.