I spoke with Eric yesterday and the talked me through getting the slide off....one of my favorite techniques as a non-mechanical person....”hit it with a hammer”. Actually, a rubber mallet with proper positioning of the pistol...worked great. Slide came off with a rain of tiny metal fragments. The interior of the slide and the body had some major gauling, corrected with using pin-fines and a fine Drexel on low speed. Now I can rack the slide without significant resistance and snap the trigger (had to reset the trigger bar spring twice as it would come off with the effort of racking the slide until it was finally smoothed out). Once I get a new pin for the slide I’ll try it out, but suspect there may be some issues with resistance to the slide resulting in failure to feed...will wait and see. I’m not sure I will ever be able to trust this Pup as an EDC in the future. Fortunately, I have a backup R9.
Advice: If you get more than one failure to extract properly with stove pipes/jams when you are confident you have a well lubricated R9 and a stiff wrist, QUIT SHOOTING, take it home and take it apart. Kudos to Eric for staying on top of this forum and helping all who need such help.