This will sound like blasphemy, but you might be amused how one arthritic old f*rt reduced the trigger slap on a CZ52. I carefully cut a piece leather that is about 1/8" thick to the width and length of the trigger. After degreasing the trigger, I glued it on with either epoxy or contact cement. It has been on for 200 rds and miraculously, is still attached. It reduced the "sting" by at least 50% if not more.