The 1936 GCA only regulated machines gun, it didn't stop production or availability. It's the 1986 ruling that regulates no more imported machine guns available for civilian purchase and no more US made machine guns for civilian purchase. Anything that was in the US up to May of '86 is legal for anyone to own as long as your state is Class III friendly like Arizona is. Anything mfg after May of '86 is considered a "Post May Dealer Sample" and can only be sold to Police depts and the Military or exported. So when you see or hear the term, "Pre May sample" or "Post May sample" that's what this refers to. My Thompson and UZI are going to be "Post May Dealer Samples" and will be on my friends books. They will technically belong to him for legality sake, but they'll be mine, all mine!