I want to put a new tang into a new stock but keep the old tang in the old stock so I can switch back to it if I want to. So I don't want to modify the breech plug in the barrel. All modifications would have to be in the new tang. I just don't know where to buy just the tang. I see a couple of tang/breech combos for sale and are pretty expensive to take a chance it will work.
I admit, this may be a fool's errand but the main reason for the new stock is the length of pull is too long but I haven't measured it lately. Shortening it may make the stock look funny.
I did measure it. It measures 14 1/2", a whole inch over my pull so it would look funny if I shortened it.