If you work on your rifle regularly then having it wired to the back is very convienient. I have my M4 and SAM-R wired to the back, and its probably the best thing ive ever done lol! If you have the tools and the general know-how you can do it yourself, like i did, or you can buy a new switch assembly thats meant for an M16a2 and put it in there. Once you wire it to the back though, where are you going to keep your battery? Are you going to change stocks or or get a battery bag? Also, if you are wiring to the back just becasue your getting a new RIS system, have you considered just getting an AN/PEQ batterybox?