If an unknown intruder is coming up the stairs at oh-dark-thirty, pretty much all relevant questions have been answered enough to stop him. I want something which is pretty much assured to one-shot-stop, something which can penetrate pretty much any body armor a perp might have, something which will likely fail to exit a second layer of Sheetrock (avoid over penetration of interior walls), something which I can carry in one magazine enough to end pretty much any fight (running out is very bad), something which can be suppressed to at least tolerable noise levels, something which can do all this in a fairly short package for indoor maneuvering.
The solution is a suppressed AR15 SBR loaded with carefully chosen ammo.
Don’t tell me nobody needs an “assault weapon”. I do.
Anybody asks me this question I refer them to the movie “Panic Room” with Jodie Foster and Dwight Yoakum. Most have seen it, and I simply say “if I’m attacked by three men in my house I could easily need 20 rounds to hold them off until help arrives.” People just don’t want to believe something like Sandy Hook or Panic Room could happen to them, so they shut it out. Face reality people.