Is it possible to buy a barrel from a custom barrel manufacturer that is ready to go all I would have to do is twist it on and head space it? I might be a little confused. I seem to think I can simply order a barrel for say a savage 11 or a 700 bdl and install it and go no go gauge it and its ready to go. Is this possible or would I have to have a gunsmith fit it to this specific gun no matter what.