[Liberated]

About the m16:
i don't really like how you colored it, in my opinion it needs more contrast, metal is shiny.
I also didn't really understand some of the shading going on inside the ´body´ of the gun.
The overall shape looks fine to me, but in my opinion, both the stock and the barrel were too long, and the body could do with a bit more length, i also thought that the body could do without the black lines inside of it.

I usually find myself struggling with words when it comes to critizing a drawing, and thought it would be best to make an edit to show what i mean.

edit: I resized the picture of a real m16, and found that your version is more accurate, yet in my eyes less suited for graal, i also don't know what era's original m16 looks like.