I've got a fair amount of 5.56 ammo on hand, enough for a couple classes and a few range trips, if it comes to that, but there was one thing I noticed at the show that had me slapping my forehead and feeling like a maroon.
See, while almost all service rifle calibers, even 7.62x54R, were effected to one extent or another by the hysteria, spam cans of Russian surplus 5.45x39mm were still ubiquitous and extremely reasonably-priced, especially by contemporary standards.
If one had a switch-barrel AR upper from MGI Military, like the one pictured below, one could just swap in one's 5.45 barrel and bolt and be assured of a supply of cheap and readily-available centerfire ammo...
|...and it uses standard AR barrels!|
Incidentally, this should have occurred to me much earlier. During the last great ammo panic, smart people were using factory 5.45 ARs from Smith & Wesson to keep their hand in when high-volume shooting with factory 5.56 would have been nearly prohibitive.