umh... it's possible making the 3d models of them easily... but... what about textures? can we see an image with good details? because they are just colored shapes...
by the way.... my vote is 8/10 because they are pretty good ^^
in the sniper... you made a wrong stock... that's ok for a rifle... but the shot of the sniper is different... it has more power... so with that stock the weapon will aim down because it slips on the shoulder... make a curve at the end ^^