Jackhammer
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. While the Jackhammer did reasonably well in its military trials (firing over 50,000 rounds without issue), it had various issues that kept it from being accepted; such as the lack of ejector, large frame, low magazine capacity, and, most of all, the designer's lack of funds to further the project. It is not clear how many guns were made as it never left the prototype stage, but there is just one functional prototype in existence as the rest were sold to other countries and disappeared or destroyed.
Tom Clancy's The Sum of All Fears
The 12ga Auto SG is a weapon featured in Tom Clancy's The Sum of All Fears. The weapon can be used to breach locked doors.
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