Actually, there are states where ammunition purchases are heavily regulated. In California, you must show ID and pass a background check to buy ammunition. California is also one of the states that imposes limits on magazine capacity and, in attempting to ban “assault weapons,” requires AR-platform rifles to have certain “evil features” removed by manufacturers before they can legally be sold or possessed. As mentioned above—they’re the state with the highest incidence of school shootings—these restrictions don’t necessarily translate to less crime.