I know it’s lame, but here’s a sniper rifle I modeled for my game:
It’s nothing great, please give me some crits! 
I’ll work on the textures, too. Thanks! 
Perhaps u could bevel the edges or turn up the subsurf, but good start.
well if it’s for a game, it would have to stay low poly :).
Good start, though the main part of the body, could use a bit more poly’s…to round it more.