I am interested in this setup. Do I need to do something special (modifications) with this optic to fit and co-witness with factory PDP Compact 4" sights?
The factory sights don't co witness with my 507C. If we didn't need a plate the sights would be kinda usable. I'd imagine the 407C or 507C bodies are the same just the reticle is different so Vulcan or not I'd say no. Can't speak on the 508 or 509 but I'd guess no on them too but maybe. I'm almost 100% certain regardless of the holosuns you'd need different sights