I've done the apartment dwelling from time to time and was also concerned about the possibility of having to fire my weapon inside. I've noticed lately that Beretta has a new line of carbines (Cx-4 Storm) that are short, would be easily handled and comes in 9mm .40 S&W and .45 acp. I would think that just based on the muzzle velocities, the .45 could be a potential choice for indoors....yeah, its gonna go thru the sheetrock too.