As Marc so correctly stated, the first thing to try in a malfunctioning Luger, is a good quality modern magazine. They are much cheaper to purchase than the original version, and for the most part, guarantee that the mag spring is good. In the USA, many pretty much stick with the Mec-Gar mags, but others have had success with other makes also, including myself with Stoeger OEM mags. A new modern mag would be my first approach to your problem.
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