Banhammer.
/thread
Also, I don't get why everyone thinks that the OSR is so OP. For one, to actually get it to insta-kill, you have to right click to zoom in. When you're zoomed in, you go extremely slow. And when you're not zoomed in, it does about 2 shot kills. And the bullets actually travel instead of getting to the target instantly. Not to mention that you have to "reload" after each shot.
So it balances itself out.