...the long bbl guns and the riots were:

made at the same factory
made around the same time
inspected by the same people
stamped by the same people and stamps and machinery
served in the same military
treated the same
served thier country the same
and are both a part of the same history.

Any surprises here? I'm just saying you have a nice orig. collectable there. Cutting down the orig bbl will not make it an orig riot. Replacing the bbl with a short one will not make it an orig. riot. The internet is not a know-all of info. Buy , beg , or borrow one of Canfield's or Poyer's shotgun books.

Chris