Elisha Collier

Elisha Haydon Collier of Boston invented a flintlock revolver around 1814. His weapon is one of the earliest true revolvers, in contrast to the earlier pepperboxes which were cumbersome and inaccurate multibarreled guns prone to misfires, or even exploding. In addition to being singleaction, Colliers revolver was selfpriming a compartment automatically released gunpowder into the pan when the hammer was cocked.

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Source: Wikipedia