i have a hankering for a 3" 38 Special j frame. I currently own a 640 no dash 38 special and a Model 60 no dash 38 both with 2" (snub) barrels. I am considering getting the Model 60 re-barreled. but there's a couple things i need to know. Planning on looking for a 3" used barrel...is the threaded barrel shank on a j frame barrel the same size/diameter as a k frame barrel( will either one work for my j frame), and how much should it cost to change barrels and adjust cylinder/forcing cone.....Mike