My plan for my SOPMOD(I have an Army clone so it will be forward wired) is to put all the wires and battery in a PEQ2 or PEQ16. Plenty of space in there for the Chimera and a buffer tube 11.1's I have. You could probably(if you have a PEQ15 on yours) is wire to the PEQ15 and store the FET there and then send wires into the rail to attach to your battery.
Is the part circled in red on the R43 have threads inside(tapped)? My TM SOPMOD's lower and buffer tube threads are stripped and I'm considering buying an R43 and just putting my SOPMOD's guts into the R43 lower. I'm trying to see if it's tapped so I can keep it rear wired.
All right, dumb question, but are any rear wired? I was hoping to have 2 different uppers(one from my TM SOPMOD and then one from the ARMY clone) as well as 2 different powered lowers, or one as a back up, and just be able to swap uppers easily back and forth.