The loom on the ACR/R is cactus. Decided to rewire it into rear exit rather than current front exit. Scoured most sites and can’t find one. Does anyone have a source for a J10 wiring loom?
I have one here that is an aftermarket Silver Wire Kit, sold as a forward wire length straight out of the packet.
Front wired because it was for the ACR DMR BUSHMASTER Replica, which is fitted with the Sniper Stock, so the battery had to go live somewhere else! 
Might be worth doing a search for something like this, which should be more readily available than a stock wiring harness, and pretty easy to simply convert it to rear wired by cutting and joining the two battery wires to the kit.
If not, they’re pretty easy to make if you have all your original switches and connectors etc, and even if you don’t, everything to make a complete new harness from scratch is easily available and would only take about half an hour at most to put together 
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J9 wiring is the same, except the wires on the rear to the battery are shorter.