You have won all the internet points for the day. This is literally the all around best rifle setup for everything in SHTF - hunting, stand off distance for horde management, and if things get real sporty, you have an area effect weapon. Now excuse me while I slink off to the corner with a few kleenex and the image of this thing...
It's very easy to become a competent rifle grenadier. Even if you are shooting inerts, no one wants to take a 2.5lb lawn dart to the head