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It was done back around 1890 something by Hiram Maxim and reports were that no one wanted to shoot it after a couple of rounds. The gun vented gas before unlocking (sort of) by way of two vents in the sides of the receiver. It was apparently a lot of gas. It was a .455 Cal. and looked just like a Ruger Mk II on steroids. I believe they only made 2 or 3 of them.
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