Mario,
Welcome to the forum.
The Luger is a rather unique mechanism. As mentioned it is balanced and it's proper cycling is dependent upon that balance of forces.
Most gunsmiths are not familiar with the Luger mechanism. There are a few specialists that have studied it and understand it. You'll also find that experience here on the forum.
Some of the parts you'll need to check are require dis-assembly beyond field stripping. If you're not comfortable with that, you should get it to a gunsmith familiar with the Luger.
In addition to the problems mentioned above, there might also be problems with the chamber which are preventing extraction.
Without pictures or the gun in hand it's hard to help much further...
Marc
__________________
 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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