The bb does not come out of the scope, so the scope must be zeroed in for a specific range and the shots adjusted by the shooters aim at different ranges/windage.
Also clarify your post, or if your English is not very good, I suggest going to a Airsoft forum that is based in your country that uses your language.
Either that or you are just another 7 year old that just posts for the sake of posting and somehow has a hot shooting Airsoft sniper rifle.
Edit: More on your question, most scopes sold at Airsoft sites DO work , amazingly, unless you get a lemon.
The myth of taking an empty toilet paper roll and attaching it with adhesive plastic onto the rail system of your gun making a effective telescopic aiming device is UNTRUE. One example of a scope that DOES NOT work.