I am petty sure that is not a "Redneck" installation....maybe "Hillbilly".
Darn stupid though, I have seen a lot of crazy $hit, but that is the first time I have ever seen this this particular scenario.
Sticking the #12 conductor under the lug with the feeder conductor would have been enough to make you say "Who the HE!! did this"..... but running a framing screw through the feeder conductor....Come on, "Who the HE!! does that????
See if your friend can get a picture of this guy, I am very curious to see just what this brain child looks like.
It is UL approved, see the sticker.
i am wondering however if it is allowed to have a red cable connected to a black one without label. and how about this dirty white one, it does not color with the black ones my wife would say.
Whenever I have ever seen anything like this done it has been with nails and the wire wrapped around the nails! Quite common in domestic situations to reduce ones electricity bill! I must admit though generally the nail has been wrapped with insulation tape LOL.