Like BBI - A Thompson is on my list, along with a Sterling, and a M712 Schnellfeuer - when I move to a free state a whole host of machine guns are coming to my house.
I have zero need for it, and it's not a gun but I want a Salvo 12.
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But right now at the top of my "no need, entirely stupid, absolutely useless, but completely irrationally WANT" list is a Standard DP-12.