CZ P-07 issues

[Ebow1]

This is for a buddy mine. He's got a CZ that's locking the slide back with rounds still in the magazine. This is occurring regularly between 2 different magazines and 2 different shooters. He's took it to the gunsmith at Nashville Armory, but I'm curious myself as to what it could be. My only theory is faulty magazine springs aren't pushing the rounds up right and sometimes it's not registering that there's a round in the mag causing the slide to lock back when it shouldn't. I didn't get a chance to look at it myself so that's all the info I can give.

 

[itchytriggerfinger]

The magazine follower is what pushes up on the release to lock it.  If it's locking every time, with rounds in the mag, there is something pushing it up all the time.  Depending on how you hold the gun, are you putting any pressure upwards on the release?