Well.. for up close SD role.. -and this is just how I'd do it.. I'm sure many would disagree-
I would want a large apature red dot of some kind.. very fast target aquisition.. 0 magnification
Think I'd put on a laser, for even faster aqusition..
I would want a good tac light for sure.
50rnd mag goes without saying.... but I said it anyhow. LOL
I'd want a sling that could be thrown over the shoulder super fast...
I'd even consider a supressor.. the PS-90 isn't super loud.. and its not like you would be using it every day indoors... but in tight quarters the sound could be pretty damaging..
again.. that's my personal preferance.. some might JUST put on a light, and call it good... and it would be for indoors 15 yard max fighting... but lets face it.. part of the fun is trickin' it out.