Amazon would just have to have a policy along the lines of, "We only sell guns via gun stores in your local area," Federal law already requires that anyone sel

Amazon would just have to have a policy along the lines of, "We only sell guns via gun stores in your local area," Federal law already requires that anyone selling guns by mail-order do exactly that. A gun can only be shipped to a licensed dealer, who must then perform a background check on the buyer before handing it over. It's common enough that almost all gun stores have a set fee for providing this service.