The Pancor Corporation Jackhammer was a 12-gauge, gas-operated automatic shotgun designed in 1984 and patented in 1987. Only a few working prototypes of the Jackhammer were built. In the late 1990s, the current owner of the design, Mark III, attempted to sell the patents, prototypes, and production rights for $350,000. Nonetheless, its distinctive appearance and futuristic design have made it a prop in action films, television programs, and video games.