Here is a link to a post on antother forum. As mine has a 32" barrel, the hinge pin is removable and the fore stock does not snap on, I am certain mine is a model 1900.
http://www.thefirearmsforum.com/showthread.php?t=52723
b.goforth twice notes that the gun should not be shot with modern ammuniton and should be considered to be designed for black powder only.
The gun depicted is just what I have, except this is a different barrel.