I was thinking about grabbing this old semi-sported No.4 from one of the local shops for a possible restoration/rebuild project. It hasn't been altered other than the timber cut down just behind the center band and the "hook" sanded down on the butt stock. Clearly a simple job but the finish is gone and covered with a very light surface rust that hasn't begun pitting and rubs away with my thumb.

If I remember correctly it was dated 1942 and produced by Maltby(my fav) so an oil blackened finish would be correct. Now with the above being said, how should I go about doing it? The only info I have is that the metal has to be heated and dropped into oil, can anyone get more into detail of oil blackening pertaining to Lee Enfield / British service rifles? I would appreciate it greatly