They'll move to "bullet control".
You can have all the "Weapons of War" you can carry, but 5.56mm will be $27/round and you have to fill out a triplicate form for each cartridge purchased.
The eggheads in the Puzzle Palace will wonder who these new Mega corporations are: Lyman, RCBS, Dillon, Lee, etc.
Larry Potterfield and the Brownell family will be the new plutocrats and buy Google, GM, Microsoft, Berkshire Hathaway and the Department of Defense.
Then they'll go after brass, nitroglycerine, primers, lead.
Mining, smelting and casting will become the new economy business' model. We'll reopen the smelter in Butte, MT and convert it from copper to brass!