Here is some silicone oil that I found.http://www.ebay.com/itm/NEW-Traxxas-Silicone-Dampener-Oil-1666-/331311263792?hash=item4d23b0b030:g:E9gAAOSwDk5UCgZV
just been given a MK1 hawk in a bit of a state and only has the .177 barrel which was seized solid in the block but now comes out fine also got a Diana 25 again in bad shape
You may want to cycle the barrel about half to 3/4 the way open but not far enough to actually cock and latch it after putting the oil in the port to help spread it on the entire wall of the chamber and then let sit overnight with the barrel broke open.