You can still buy a Tommy Gun... that operates just like an AR-15, one trigger pull = one round down range.
And you can buy a real one, as well, if you've got $20 000 or so lying around that you don't need. Several of my buddies have one - legally, of course.
You actually can buy the fully auto version of either. It requires a federal tax and you are scrutinized by the feds. But you can still buy them
One can still buy a tommy gun - 20 or 30 rounds with one trigger pull. Just fill out the paperwork and pay the tax.
Anyone remember the APACHE Tommy gun knockoff from 50 years ago? The government clamped down on it when it was found you could make it go full auto if you pulled the trigger AND pressed the trigger at the same time.
The real submachine gun Thompsons are still available. There are several going up for auction next month and you can buy them (if you reside in a state that recognize the 2nd Amendment correctly) by paying a $250 Federal tax and pass the proctological background check the FBI and ATF will put you through. They sell for between $25,000 and $35,000 (including auction premium), compared to the $2,000 to $2,800 (including auction premium) price the semi-automatic Thompsons sell for which can be purchased in the rest of the states that are not completely insane about the 2nd Amendment such as California where they are banned, because they are “ugly” assault weapon type guns with a pistol type grip and a removable magazine. The semis cannot be converted to fully automatic versions.