It's a late model No 4 Lee Enfield (flip sights instead of tangent; cutout instead of sliding bolt release).
If you're really interested in what it is exactly, post pics in this forum -
http://www.surplusrifleforum.com/viewforum.php?f=27
I bought one of those at my local gun shop a few weeks ago for $150 with a chopped down stock...There's another in unaltered condition for $350...
Savage here in the US made some of these; so did Longbranch in Canada...