Beretta 93R & Tokarev TT33 full-auto.

[Fr. Frank]

I was under the impression a fully auto .22 was legal

Only if you paid the $200 tax and went through the application process.

However, there are a number of devices made for .22's (and other semi-auto rifles) which make a them seem like full-auto, such as the BMF trigger crank, Hellfire & SuperTac trigger attachments, etc; but each in fact activate the trigger separately for each round fired, even if very, very quickly. Prices range from $20 to $60

Check out some here: http://www.rapidfiretriggers.com/