lol.... not nice to trade in problem guns. Your Glock 19 sounds like easy fix with recoil spring change. I would get a new recoil spring for it then list it on grunbroker.com get about $700-$800 right now because of the panic buying then buy that Colt commander new somewhere else. I wouldn't trust a used gun for carry.
SHTF vs TEOTWAWKI you ask? SHTF, just some crap on the ceiling and walls, TEOTWAWKI end of the world as we know it. Orignally made by 9mm/®™©