Just so you know, the S&W M&P mags will not fit in the CZ, they are too wide. I just gave it a try. The CZ mags will insert into the M&P, but the catch is weak at best. I suspected as much before I tried it as I have to adjust the mag pouches quite a bit when I switch guns with my holster and belt. Perhaps a different S&W model may work, but not the M&P series.
You misunderstood the OP. He is talking about using .40 S&W calibre CZ75 mags in a 9mm CZ75.
CZ .40s&w magazine would need to be 'modified' to allow 9mm ammo fed from it. Thus rendering it ... ‘not so legal'...
Mag lips are too wide spread on .40



























