vfc scar hop~up問題？

Did anyone have scar hop~up problem? when 調到最盡,說明書話會向上飄個邊,但d bb彈都係向下飄,冇向上飄. i find out the way to take care this problem. you can use the orginal marui M4 plastic hop-up unit. just cut shorter both side of the rail. it will fit on  VFC SCAR. but remember when you put the lower body in, you need to push the hop-up foward first then put the lower body in. so it wont damage the air nozzle. if any question "PM" me la