I was in the "evil" Gander Mountain across from my office tonight- piles and piles of 7.62x39.
Everyone can take a deep breath of this one. I personally believe there will not be a shortage. Are you aware at how many countries make the stuff? Sure, the russian ammo may disappear for a while, but countries like Ukraine and Romania are also heavy exporters of the stuff. Also, the US has yet to place any sort of sanctions or trade embargoes on Russia. 7.62x39 is still being imported at it's usual rate