Jan-Erik,
Welcome to the Forum.
Shooting the Luger is a great and satisfying pleasure when everything works right. Gerben's information is very good and useful. The primary cause of the problem which you describe, called 'stovepiping', is failure to hold the pistol firmly enough during firing. If the wrist is loose and allows the gun to rise during firing, too much of the recoil impulse is absorbed by the wrist and not enough is left for the pistol to function properly.
--Dwight
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