It may be able to be brought back to working/fireable condition
with just a little amount of penetrating or gun oil !
Unless the rust has 'bloomed' and chunks can be scraped off,
it may need only minimal cleaning to make it function.
Think about that rusty bayonet with the button stuck,
and how a spray of WD40 or a light oiling will free it
up in a matter of minutes...............!
Shame to have to have it deactivated but you cant keep it as it is.Is there a museum who you could give it to that is licensed to display live firearms?Im sure they would ease your burden and take it with no awkward questions asked.If you go about things the right way it should keep you out of some deep brown stuff!!!
i think a mused is the best way to go ! then it dose not have to be welded !
still got it