Heavy cannelured (crimped) 5.56 rounds from an 11.5” barrel. Seems it has lowest wall penetration while retaining the still-effective incapacitation rate prior to hitting that wall; fragments upon first penetration (sheetrock or perp), minimal effect upon hitting second layer of sheetrock. Best option short of reinforcing/armoring key walls.
Yeah, 5.56 doesn’t have a good reputation, but given the scenario there’s an important tradeoff between doing the job and not doing it “too well”.
To the point of the thread: given a viable application and cold analysis of the problem, average Americans DO need AWs.
Not only do we need "Assault Weapons" an equally rational analysis of the constitution shows that it was designed to protect "the people" as being a bulwark to tyranny. We can't fight tyranny unless we have the same tools as those that want to subjugate us.