Truth is, the government bought it all up and there is none in the distribution channels for Walmart to order.
The government doesn’t buy ammo from Wally world.
They get it via contracts with manufacturers.
It takes time to write proposals, find potential suppliers, evaluate them, then award the contract.
Bureaucracy moves s l o o o w l y.
This is a good point. I seem to remember the federal government buying up millions of rounds last year. Kind of interesting.