It's not legal in the states. At least not for personal use. It would have to be registered as a Post '86, which would make it illegal for private ownership. I have seen (not in person, on the internet) another switch similar to this one, but it used a sliding bar rather than a rotating knob. I believe it was manufactured in the US as a LE only item. I doubt the company is still around though. I can't imagine that they had many sells, because a 1200 rpm pistol strikes me as really fun but about tactically useless.