[HellRanger]

So it's already wired to the back...

In order to tun the wire into the stock, you can fill the part to the buffer tube fits over so the wire can run in between the buffer tube and the rear part of the lower receiver.

Or you can drill a hole in the part instead of filling it down, but that takes away some of the strength away.

Didn't it come with instructions? I remember installing it one recently and it came with instructions. All the others I installed prior to that one were used and had no instructions.