This may not apply, but I've used Pro-Mags for the .40 Witness in my CZ75B and have had mixed results, some of the negative ones owing mostly to a weak slide stop spring in the gun.
They seem to fit just fine in my gun, but I've read elsewhere in this forum that some tweaking was required to make the mags function in other weapons.
I've also used these mags in my CZ40B, and after some experimentation believe that some new mag springs are in order.
