Privately made firearms and in-state sales are completely legal in the United States, enshrined as an enumerated Constitutional right. No serial numbers require

Privately made firearms and in-state sales are completely legal in the United States, enshrined as an enumerated Constitutional right. No serial numbers required. Sale of firearms may be regulated if crossing state lines, hence the Gun Control Act of '68, but a federal database of firearms / firearm owners would of course be completely unconstitutional.