It looks like some sort of drill rifle that used a M91 as a donor rifle. A lot of U.S. made M91's were sold by Bannerman and converted into drill or cadet rifles for use in military schools and academy's. Are there any manufacturer markings legible on any of the parts?
I looked it over pretty thoroughly and found no markings on it at all. It was actually part of my grandfather's rather extensive collection. Unfortunately I did not find it until after his passing earlier this year and its not listed in his inventory notes. So sadly I have no idea when or where he got it or if he had any back story on its origins.