The Pancor MK3A1 or Jackhammer is a 12-gauge, gas-operated, fully automatic shotgun. It was developed by John Anderson in 1984 and patented in 1987. Though unconventional, the Jackhammer can best be described as a gas-operated revolver. Many parts were constructed of rynite polymer to reduce weight. Layout was of a bullpup configuration with a 10-round revolving cylinder that fired conventional, 12-gauge shells. The cylinder's method of rotation was very similar to the Webley-Fosbery Semi-automatic revolver, an operating rod being used to rotate the cylinder. It is used by the Alliance of Nations and the Axis of Empires

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