Quote:
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Sometimes all its six barrels would go off at once, and then there was no safe place in all the region round about, but behind it.
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Mark Twain
He was talking about a multiple barreled gun. I'm not sure the one in the pic is a pepperbox since it has one barrel. It looks like it's double action - pull the trigger and it cocks then fires the round.
http://en.wikipedia.org/wiki/Pepper-box (Transitional revolver)
According to that article, it looks like the transitional revolvers were also prone to chainfires.