Anymore, I use only ProMag 40 S&W mags in my CZ100. They fit well, I like the follower better than the factory mags (mine were really old), and above all, they have never failed me. For me there is only 1 downer for these mags. They have really bad springs. The CZ springs are not any great shakes either. For the price, they can't be beat in a CZ100.
Good shooting,
Mike