Oh yeah Stalker, I'm pretty sure theres some speaker wire in the handguard of the HK417 of mine you have. Wasn't me, got it that way.
I'm no gun doctor but got an MP5k used that wasn't working. Took the handguard off and someone had, instead of soldering the wire, taken a copper bar, drilled holes in both ends, and wrapped each piece of wire around one hole. Bandaided wiring job with no soldering required. Also found out the fuse holder had been glued together with no fuse in it, just to complete the connection (guess they couldn't find a fuse.) The exposed fuse holder and the copper bar would touch sometimes and there was charring on both.
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