I hadn't thought about this incident in years. It involves a gun that I certainly didn't own and never fired, but I did handle it. Please don't tell the feds---
Back in the early 80s I had a friend with a pawn shop. When he got a gun that needed a little work or if it was an unusual piece with which he wasn't familiar, he'd give me a call. One day he got me over to his house and showed me a .22 that he knew nothing about. It was built like a 1911. Think Llama .22. It's markings were all in Spanish. I think the brand name was Zorro. It had an odd little lever sort of like another safety. Actually, it was a switch for full auto fire.
I explained the feature to my buddy. He was really glad he didn't get the gun through his shop. As you can imagine.
I wanted to take the gun out some deserted country road and try it, but wisely my buddy said no.
I don't know what happened to that little gun. I asked but never got an answer.