There has been some excellent advice on the trigger. Some things to try: study the various Luger animations and dis-assembly videos on YouTube and understand how all the parts work together. With the upper off the frame, upper can be cocked and the firing pin released by pressing on the front of the sear bar. This is helpful in isolating issues. I suggest snap caps to prevent damage to the firing pin from dry-firing. The side plate can be attached to the frame with the upper left off to allow operation/inspection of all trigger parts in the frame. Good luck, have fun and let us know what you found.
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