I've always been an proponent of Murphy's Law -- that something's always going to go wrong, and when it does, it will be at the worst possible moment.
That's why, if I can, I try to mount red dot optics at the back from a side rail / mount (e.g. RS Regulate) so I can co-witness with the iron sights if the optic happens to fail. The problem is, if you want a straight line AR-type stock (which I do), the iron sights on the Vz58 are too low to comfortably co-witness with the optic.
I wish there were taller Vz58 iron sights readily available, but until then, will have to improvise.