This was a common variant in the early 1900's. Here is a Rigby with the take down feature. A rather famous gun. Belonged to W.D.M.Bell.
[img]http://s46.photobucket.com/albums/f145/gunsmithing/?action=view&current=275-4-large.jpg[/img]


Pondoro Taylor,Elmer Keith,Karamojo Bell,and Jeff Cooper knew what they were talking about.