I'm not knowledgable, but I fixed the same grip problem on my beater luger by making a skinny paper shim, about a 1/4" long and a 1/16" wide. Install in grip frame groove above mag. release and behind trigger. Trial and error fit. Stick in place with small drop of linseed oil. My right grip fits tight, and you can't see the shim. Make sure shim doesn't protrude into mag.well opening. Worked well for me, has survived 120+ rounds and still tight. Good luck Stevie
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