But having A SINGLE back-up weapon is nothing more than prudent planing IMHO......So taken in the context that you said it, I agree. You do not need a "golf bag" or "trunk" full of different arms for different scenarios.....You need two maybe three
! A side arm to carry here and there( and maybe a back up if it makes you feel better), and a close quarters arm with rifle ballistics or atleast a little more punch for upto 150 yds, no further should be needed(armor penetration is a plus in this aspect of a back up). Agiain this is just my opinion and subject to change without prior notification......