There won't be a problem with ammo availability. We cause the shortage ourselves by panic buying. As we did last time.
Increased restrictions will be put on the availability firearms that can be fired semi-automatically, and on hand guns. They will look for what they consider questionable motive to own. Even then, they will prefer to sell you a stamp and enter you into a register than to impose a ban. They are all the same, they all want our money, and they want to be seen by the scared sheeple to be making an effort to control firearms more.
It's a shame they won't put that energy into something like solar power or growing our meat more ethically.
Mark them words.