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of course its a promag and Friends dont let friends buy promag avoid Promag at all cost

Promag aren't the best quality. Alot of people apparently have issues with promag, I've only used their ar15 magazine and really haven't had issues but alot of people have. So guessing that's the issue,it's the magazine not your firearm. Hope this helps.

Try using it with only 15 in it sometimes that will help with promag

factory CZ mags here https://www.cz-parts.com/cz-p-10-f-magazine-9x19-19rnd

here are 21 round mags https://old.themagshack.com/shop/cz-p-10-f-9mm-21-round-magazine/

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