Should have clarified: Right now I have a HK .45 USP. I am looking at a higher-capacity weapon as a back-up option in a worst-case scenario (multiple intruders basically, which I know is an exceedingly rare scenario but not unheard of). Everyone seems to love the AR; my concerns are about the round that it is usually chambered for. Just from talking to guys who have been in the service, I know it packs one hell of a range and goes deep. I have heard stories of the round going in the one side of a person and coming out the other side before coming to rest in something else.