Okay I know I always ask stuff for my friends but I'm just trying to get to know tech work pretty well so I can, well fix guns. So my friend has a G&P M4 and he went to Play today at an event. But a part of the way through his gun broke and he came home. It has a loud clicking noise every time you pull the trigger. There is a little bit of motor activity but not much. I have tried to unlock the gearbox but that was not it and of corse I tried motor height. The battery was fully charged. Does anybody know what that might be? The trigger also has some resistance right before the click. If you need more information I'll help as much as I can but I don't have the Gun right with me so my knowledge of what is happening is just based on what I just tried. Thanks for any help.