welcome,
to answer your question, i dont know. Also dont have a short rail either....
you dont say where you are from, but ...
> if you have any gun shows in your area, you may want to take your CZ and try various mags.
> or if you have any gun shops in your area, you may want to do the same.
> if you have any gun friends with CZs, you can also ask them too. Friends are great resources...
> you may want to remove your grips and see if those are causing any issues...
> just an fyi, on my pre-Bs, i found that some of the larger cap +16 mags would fit, but i would again, take teh gun and try. If you have any other mags, you could try them too.
good luck