its a nice looking rifle , i could be wrong but i think i caught your post elsewhere and noted a couple books for referance , if not :

charles stratton "the pattern 1914 and u s madel 1917 rifles

and his SAIS # 10 - "303 pattern 1914 rifle"

and for added info related :

c.s. ferris "united states rifle model of 1917"
will give you info , mostly related to the later US contracts

i do beleive your rifle is wearing a US M1icon sling tho , needs a proper one you know :>}