hey to help you guys out, these videos might clear up some things for you about choosing your hop,
Increase any Airsoft Gun's Range and Accuracy: G-Hop Installation Guide (Lazy Man's R-Hop) - YouTube and
My experience with R-Hop: I Like It, But I Like G-Hop More. - YouTube check them out, im currently moding one of my barrels for the g-hop everyone that does it right likes it better then R-hop of any sort. hope this helps