It appears that there is not a screw holding the grips. The grips may have been glued to the frame. I would, carefully, use a shaving blade with one side only and slip the blade between the grip and the frame. They should come apart or try to heat the grips with a hair dryer and try to soften the glue and then try the blade insertion and try to pry them apart. Go slowly and carefully not to crack the grips. I have never encountered that problem but it is the best way I know to remove the grips without a screw.

Nick

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NRA Instructor\GCA Gunsmith