i found another dealer with 15 round mags that look exactly like the preban mags Andrew grabbed for us ( my mag does lock the slide back, i got lucky too). talked to the guy and he says these are direct from CZ usa, and he believes they are new manufacture. i could not find anyone else selling these 15 rounders.
Jeez I grabbed the wrong 3 for myself . I hope it's just the mag springs that are the issue and not the followers. But I'll just have to order some new followers from CZ if the springs don't fix it.
Those mags look a lot like the ones we bought. I'm curious if they have any markings (like MecGar for example) on them? I don't 'think CZ makes any new 15 round mags? For the compact models maybe? I'll have to message the seller. Good catch.