Couldn't stand to go through that entire video but a few serious things.
First of all, I carry, usually, a .45 but whether .45 or 9 mm, I was trained to always carry two spare mags.
Secondly, if society goes down the tubes, the two most available calibers will be .22 and 9 mm. There's just so much of it in the system.
It's just good thinking.
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("Hey, when everyone is out to get you, paranoia is just good thinking."--Fever, (w,stte), "WKRP")