You set the hop up so that it flies straight, personally I find the best way to do that is actually looking down the side or even firing from the hip. It will take some fine adjustments until you find the ideal point. Once you do then you have to zero your sights/scope to where its then shooting. It doesn't matter that your sights are currently off, it matters that its shooting well with good lift and that you can zero it at the effective range (just before they drop).