You're thinking of the 1988 Waller case and the 1992 Ho case, both involving transferrable pre-1986 MAC-11 machineguns. The NFA items this article deals with ar

You're thinking of the 1988 Waller case and the 1992 Ho case, both involving transferrable pre-1986 MAC-11 machineguns. The NFA items this article deals with are post-1986 samples, which require law enforcement agencies to write a law letter for class 3 SOTs to acquire. No post-1986 samples have ever been used in a violent crime.