A guy I used to work with, probably deceased by now, had an MP-40 and she ran full auto. He was very careful about who knew that he owned it. He told me he purchased it from a guy he befriended in a tavern. It may have been registered before he purchased it, I have no idea, but state law here restricts having a machine gun in your possession and he knew that.

There are a lot more machine guns out there than people realize.

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That's just somebody talkin.