after Complete Economic & Social Collapse?
Well, as long as you asked,,, sorry, thats not a air guns place, at all. Although if thats all you got go with it....
In "complete social collapse" as you say, there will be marauders, stealing food/all necessities. Maybe raping and pillaging..? Maybe with ballistic vests/helmets and serious weapons of there own. And the very definition of social collapse means no law enforcement, a lawless society. Good chance the jails will empty, letting many bad actors escape as has been the case in Italy right now..
I for one want my m4 556 with green tips on its sling right by my side, with my 40cal glock holstered and my 9mm in its ankle holster. And plenty of ammo on hand. My wife and brother and friends will be similarity equipped to defend/protect the homestead.... I do not want to go up against invaders with AK47's with my single shot Texan45, or Kral .25, both air guns I love. The right tool for the job could make all the difference, and an air gun is the wrong tool imo... Now for survival in the wild, putting food on the table, AG is fine.
Although hunting will be very important its not the top priority in lawless urban or rural type areas, at least not in the beginning stages of total social collapse... For hunting large game, my 308, and when hunting small game and or stealth is needed, then air guns come out. At times like complete social collapse I'm not wanting to challenge my skill level with 200 yard air rifle shots at deer, nope, just want to put food on the table as fast and quick as possible. I can do this with my 308. Don't get me wrong I love my air guns and know they can kill, but for protection against packs of armed marauders in total social collapse, imo only a fool would opt for an just an air gun....
Lets pray it never comes to this, and really doubt it will in this current CV19 climate,, but if it does, way to many serious weapons/bad dudes out there for me to depend on an air rifle or air pistol for my defense of home and family...
jmo