I found that the steel ones didn’t quite fit right with an extended mag release. Too tight a fit so pulling the mag release needed to combine with pulling the mag out.
I swapped out the mag block and mag well for aluminum components and now both metal and plastic mags function well. In and out with ease, feed well too.
Thanx for that. I'm hoping that since I purchased these directly from CZ, that the OEM ones fit with no problems.