I think its all propaganda to intimidate America. Of course they really may have just done what they say but they are sending a message of eventuality, that WE the FEDERAL agencies are more powerful.
Its all about dominance, the solution is to just shine it on, because they may have billions of rounds the other side has several hundred million shooters.
Which is the bigger threat? A billion or so rounds of ammo with a hundred thousand or so shooting or the hundred million or so who already have the guns and ammo?
So I say big whoopsy do, Americans STILL have more ammo, and are buying more every single day.