For what it is worth I think you made a really good choice. I have a sickness, I need guns to keep that sickness in check, so I try to have one of
everything. However if I were to choose between the three you wanted the AK hands down would be my choice. I love my bushmaster, it is accurate, and
has never once jammed on me. I love me mini 14 and mini 30, they are fun to shoot, but leave a little to be desired in the accuracy category and I
have yet to find any mags besides the five round that came with it that dont jam. But if I were heading out the door in a survival situation I would
grab my AK.
That isnt entirely true I would grab my SOCOM, but that wasnt part of your choices.
As far as ammo shortages, I have never had trouble finding 7.62 ammo, and it is cheaper then .223. Trying to find ammo in a SHTF scenario is a moot
point in my opinion as you should have the ammo already when it hits the fan.
Get out and shoot that gun, shoot it and shoot and shoot. Sleep with it, become familiar with it, get to the point where you know every part of it,
and you could put it back together in your sleep if need be.
keep it close at all times, the way things are going you may need it. I carry a different rifle with me sometimes, today was bring your M1carbine to
work day

. That old girl spent sometime in europe in WW2, I hope that was the last of the action she will see.