Hi all;
A friend of mine has a Sears model 66 12 ga. auto that I'm sure was made by High Standard. He cannot get the bbl. off it. Gun has sat for 25 years but is not rusted and it shoots. Is it just stuck or is there some trick to it. Anyone out there familiar with these. Thanks.
mulligan

You might try to use some Kroils penetrating oil and let it sit for a day or so, then try it.
It is the best oil for freeing things up without hurting them.