siupo

I am planning to get a CQBR super version for indoor CQB use, can some current ino user tell me:

1) is there any N.P.A.S for adjusting power as the original power is 400fps which is too powerful for cqb
2) is inokatsu outer barrel the same as WA outer barrel? as I have a silver one sitting around
3) what needs to be done to use prowin magazine that originally bought as WA magazine? I alreayd have one for WA GBB
4) is changing prime hopup + AEG inner barrel suggested? or stock inokatsu inner barrel and hopup setup is good enough?