Impactguns.com is one well known dealer of ATF regulated machineguns and AOWs [0, 1]. Based in UT if memory serves. Be prepared to drop 10k USD+ And obviously the bg check / atf stamps etc. and any fees your local receiving federally licensed firearms dealer may add.

I have zero affiliation with this site, they just have a large, dynamic inventory so it makes for fun browsing for me.

0- https://www.impactguns.com/machine-guns/

1- https://en.m.wikipedia.org/wiki/Title_II_weapons#Any_other_w...