I had the same problem on one of mine. It locked open with one round left in the magazine. If you have it, the E-Book "Luger Mechanical Features" by Gerard Henrotin has an excelent description and cure for this very problem on the page titled "Troubles with the Luger". It involves some filing so if your gun is matching you might want to get a replacement hold open latch to use.
If you do not have the book, this gives you a great excuse to spend about $9.00 to get a good description of how these guns work. Of course then you will want the other 4 but for the price you won't be out very much.
Steve Richards
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