SAW.. you mean the SAW Machine gun?
I think pretty much any gun can be a sniper in airsoft, since there's not much recoil, and with a bi-pod and scope u can do pretty well. But it would be kinda silly to snipe with a Machine gun.
But then again I have thoughts about building a UMP sniper version... hahah..
That's why airsoft is fun I guess, you can build and play it how u like. Just my 2 cents.