A while ago my newest gun (a JG zombie killer M4) (no I did not get it because of the name) stopped working when I tried test firing. When it stopped working I had already shot a couple of rounds in full auto burst (semi doesn't work. It has always jammed even right out of the box) when a bb jammed in the barrel (not sure how) so I took the barrel off, unjammed it, and put it back on the gun would no longer fire. No sounds at all. I tried 2 diff batteries both which I knew we're charged. I also took the motor out but left it connected and the motor would not spin TL;DR my motor will not spin. Is it most likely a broken motor or a wiring problem? Is there any way to fix a wiring problem if there is one?