I got a mess on my hands. I popped a 120 spring in my M4, and after a few mags, my semi-auto went out. I took the gear box apart and noticed that the contact points on the gold plates that send the current looked fried. I am wondering if that could be the problem, and where and what kind plates or wiring in general could I get to replace it. I remember someone talking about rewiring their entire M4. The gears are running smooth, so I don't think it's them. Any suggestions?