on my 590 i use the action mounts on the rifle for my zeiss, no bases needed so no other screws etc to worry about.
the action comes with a groove the full length on both sides, i have 1" mounts on mine as a kind member on here gave me them, i have since then got a set of 30mm rings that do the same,
the 1" are NOT optilock but the 30mm are.
no issues with the 1" ones and i bet your bottom dollar the 30mm optilocks would be even better.
bob.