A spanish battle rifle, Cetme C. The predecesor of the much more known HK G3. First fielded in 1958, the C version is from 1964 and because the woodwork is known as "chopo" (a kind of tree) in Spain.
Credits: I try to mimic Darth Panda's solutions to the problems of shading and general details (from Darth Panda´s G3). If my drawing is "DP like", well, I think that the goal was attained! Thanks DP! Cheers.
PS: I found several kinds of flash hider, I prefered this one, with 3 holes in the side view and slightly longer than the G3 like one.