need info on how to fix gbb pistol

Hi. I have a KJW gbb glock 23. My friends were playing with it when i was airsofting and i don't know wat they did to it. When i pull it back. And then pull the trigger, it doesnt make the clicking noise and it wont shoot. Can Someone send me a video on the proble. PS:I took it apart and i didnt c anything wrong with it.