The spring on the hold open may have broken. Take a look and see how much it drops down when you hold the frame upside down without the receiver in place.
The spring normally holds it down into the frame. If it's weak or broken, the hold open many bounce up during firing.
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I have frequently advised against shooting collectible Lugers. I'm now reconsidering that, since every one that ceases to be matching increases the value of those that remain matching. Your 1938 S/42 Mauser made Luger probably has the strongest metallurgy in any case.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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