For someone who is so obsessed with restricting guns, you apparently have a profound lack of knowledge on the topic. Machine guns including the Thompson and the Gatling are regulated under the National Firearms Act of 1934. Civilians may legally own them as long as they pay a $200 tax stamp and apply for the appropriate paperwork to register them. The Firearm Owners Protection Act of 1986 limited civilian ownership of such machine guns to those manufactured prior to May 30, 1986.