The Pancor Jackhammer shotgun has 2x the AP cost as a combat shotgun when bursting. I'm sure this is simply an error from previous weapon changes. It also does less damage per single shot, and less damage per hit in burst.
Suggestion:
Give the Pancor more shells per magazine (currently 10, combat shotgun has 12). The Pancor shoots more per burst, but you have to reload after 2 bursts. As it stands, the shotguns regress from the combat shotgun which remains the king of its weapon type.