the barrel you speak of is one of the first barrels produced by hastings as a replacement for the remington guns and the first barrels were threaded with what I think hastings refered to as hastings choke tube II barrel.
they used 2 different tube designations on the first barrels they produced and one was a tru-choke and the other was a metric thread.(the choke is simalar to ones made by american arms imported guns)
the one you got sounds like a metric thread tube with it's length as it is longer than the tru-choke was.
the barrel can easily be modified to accept standard style tubes as with the choke tube you have is measuring .812 then the barrel should be big enough to handle the modification
[This message has been edited by Gun Docc (edited October 07, 1999).]