Maddy: Failure to feed is usually a magazine issue or possibly a bolt issue. It may not be the magazine spring itself. It could be the follower or the magazine lips as well.
Lets start with the basic remedial trouble shooting steps first.
Do a function check of the fire arm. I am not quite familiar enough with whatever model of CZ pistol you have to be able to tell you how to do that specifically.
If that works carefully examine the magazine. The lips of the magazine should be symmetrical and un-bent. The follower should flush with the surface pressing the round evenly into the feed lips of the magazine when it is loaded with a round.
If you can swing it try a different magazine that is known to function correctly. If it feeds the problem is likely your magazines and you will need to replace them. If it doesn't feed it is likely the bolt or possibly a problem with the mechanism that holds the magazine in place when it is inserted into the fire arm. A gun smith will need to do the work for those two issues unless you have the knack and know how to fix those parts.
That is basically what an armorer would do, Those are the steps taken before a more detailed tear down is done.
If the fire arm had any corrosion or broken parts that needed replacing prior to shooting you may want to have a gunsmith go over the entire weapon to make sure some part didn't snap or have some sort of metal fatigue.
If we can't get the issue sussed out by trying the simple stuff, take it to a smith and see if they can figure it out.
Unfortunately I lack an adequate work space for even amateur gun smithing and I need to replace some of my tools after some got accidentally tossed in a clean up. I need a new punch set and new punch and dye block as well as a dremmel.
edited 18th Mar '14 9:59:53 PM by TuefelHundenIV