i have had the problem for multiple Kahr pistols. It was always the polymer frames and not the steel. unfortunately my answer was to get rid of the damn thing at a pawn shop as I tried everything you have and was never sucessful.
Got myself and older Higgins model 20 that shoots pretty well. The only issue is that the action sticks after you fire a shell. The action is smooth until you actually fire the shotgun. Then it takes an incredible amount of force to work the action. Any ideas? It’s not the extractor. It’s...