bad feeding problems

[thater]

My 1937 S/42 often jams up. It doesn't properly feed cartridges when the clip gets low. Its an old military clip that I am using. The cartriges will often miss the reciever and end up sitting vertically, jamming the action. Also, after a clip is emptied, when shoving a loaded clip in, shouldnt the action slam back into place, chambering a new cartridge? My luger wont do this. I have to pull the open action back just a bit and let it go. My buddy has a missmatched luger that, appearantly doesnt semiauto fire. He claims that he has to lift the action halfway up after shooting one round and then push it back down. Otherwise, it wont fire when pulling the trigger. The pin on the sear bar operates properly. The trigger spring is good. I took it apart many times, but cant find a problem. His feeds like crap too. But it does load a round automatically, when jamming a loaded clip in. Any suggestions very welcome. Thanks. Ben Thate