never hurts to have a reminder, thanks flounder. my plan was to do a test cut with bar stock I have laying around (recreate barrel ID, indicate, create OD thread), check with my CMM (which will let me know concentricity in microns) and then set barrel, indicate, and run. well... ok, that WAS my plan, but my production is non-stop until october, and while being a patient person, i'm not THAT patient... so I'll either buy one with threads on it or have a gun smith do mine. i think tom's got a friend who does good work, so I'll look into that if i really can't find a mkII with threaded barrel any time soon. stupid jerks, buying up even bolt action 22's.