My 2 cents is, yes lots of countries are stocking up on it, not much of it is getting into the U.S. and perhapse global unplesantries will cause the supply to dry up further.
However.... when the unplesantries are over, its going to flood the market.
An AR is always a good Idea to have around, parts are easy to come by, and ammo is made domesticaly. they are also much more acurate.
While it is nice to standardize on a single rifle calibre for intermediate ranges, the more different cartridges your guns can take, the better off you are as an avid shooter.
you can always find some kind of ammo cheap, and your not forced to buy the pricy stuff.