the hw80 i found in my partners sister barn was badly rusted and pitted , i found a yank site that said to use auto transmission oil (atf) and 0000 wire wool as it would not take off too much of the bluing, it worked well on the hw80, i also used emery paper at work and held the action in a vice and use the emery ( we use it to polish crankshaft journals and big ends) and used ot to give the action a smooth surface and the same with the barrel,i them re blued it, not brand new finnish but better than rust