Tsd socom m14 help please?

my brother had this gun nd it was fine for a bit untill it got jammed cuz he used crappy flea market bbs. im pretty sure we got it out but while my bro was trying to unjam it he kept pulling the trigger nd somthing inside broke, im not sure what cuz i opened it up nd it all seemed to be fine. i ges theres something that makes the gun shoot when u pull the trigger but now the triger is just useless. any help? maybe video links or something please