Silly people, 200 FPS would be fine for indoors depending on the location.
I know a 200FPSish gun would function fine in CamoGames indoor CQB school set up.
I know Amos had a hilarious 200FPS AK that worked magically.
A stock MP7 puts out around 250ish and its a decent little AEP.
Im outdoor situations a gun like that may not fair so well once factors like wind and foligage come into play.
"Its only a little bit on fire"