7 for the long barrel version and 9 for the short barrel version. Having to remove the fake compensator is annoying but required to remove the slide. At least they thought ahead and included a guide rod to be able to get the recoil spring and everything in place correctly.
My wife's P22 5' has been working fine when we only load the magazines with 9 rounds. Otherwise, the first one fed jams. Not worth the trouble to send in. Maybe another 400 rounds will break it in enough to not have a problem, but since it is only a plinker, it's not a big deal. It was an intro purchase before she gets a P99 which is ever increasing in price it seems. But it has been a fun gun, especially since I don't have my own .22 pistol yet.