(WIP) Sci fi sniper rifle (3DS)

Wolfer

Hi there so I'm working on this sci fi sniper rifle. Its not done yet but I got most of the model out. I like to see if anyone has any suggestions or tips. Also I have something to ask, is it a good idea to use subdivision to help with detail. I mean I know there is champfer and bevel but I think that only works for part. Just want to make sure I make it look great but don't want it to be overboard on polygons.