Not a Sharps. Not a trapdoor. Possible a made-for-the-movies based on a
Has side "ears" that come back into the buttstock for a horizontal bolt.
Side hammer, lever operated.
British maybe? Swiss/German/Austrian/Belgian? I'm going to guess from
what I see in the picture and what I could get from a glimpse of a
movie clip on Youtube that it's a Martini type tipping block action.
ETA: Getting close--- http://www.militaryrifles.com/Spain/More1870SpanPeab.htm
OK---It's a Peabody. Different versions had minor variations. Based on what I can see
in the picture, the rear sight looks like it MAY be a cut down 1866 Canadian.
OR--a Russian contract Peabody Carbine made in Rhode Island?