Looking at the pic I took of the M&P baseplate on the CZ magazine, the gap is significant. The gap is almost half as thick as the baseplate.
Just like the gap is almost half as thick as the plate on the first two stock M&P photos I posted.
All I'm suggesting is the tolerances *could* vary enough to matter to some people that it would or wouldn't be an issue. I'm willing to admit more than likely I'm wrong, but until we see the Apex actually installed on a CZ mag, it's hard to say.
If you noticed the pictures I just posted, the M&P base plate fit varies *a lot* between individual samples just as the base plate gap varies between p10 samples.
Life's too short to argue on the internet.
Have a nice one.