User blog comment:MyOpsAreBlackerThenYours/Should shotguns become seconarys in BF3 or next Battlefield?/@comment-1889554-20120405145611

Depends on the shotgun's size and function.

A larger combat shotgun such as the SPAS-12 or Auto Assault would be classified as a primary weapon system, while more specialized shotguns, perhaps a sawn-off over-under scattergun or such, could be a more secondary role.