What's the cause?

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When the trigger is depressed, the trigger lever(in sideplate) pushes on the SIDE of the plunger which pivots the trigger bar (sear). When the pistol fires the cannon assembly including the trigger bar (sear) moves backward then forward to its original position at the completion of the cycle. If the trigger is still pulled, the trigger lever will be in the location that the plunger was before the trigger was pulled, so the plunger will be pushed into the trigger bar. When the trigger is released, the trigger lever will move back out of the way and the plunger will pop back out of the trigger bar, and will be in a position to fire again.

You may want to get a copy of â??Luger Mechanical Featuresâ?� it is a downloadable e-book written by a forum member that shows exactly how a luger works with text and animations. I found it on this site and it was most useful.

Hope this helps,

Chris