Is there any tutorial about how to do "quickshot"?

With the gl i can´t do more than 3 quick shots....idk why!

This is because you are pressing the button without precision, you should focus and push the aim button in two times the first one has no more precision from the first you must be more precise and push the button very accurately. Note that you must press the aiming button and the action button right after the first shot you must hold the action button and never release it after that you must press the aim button in two times in a row so that you do not Erre the right time. If you miss the time to shoot then it lowers the mira.Sobre the tutorials on youtube but I can not post here if I can not be banned.