The SPAS-12 is a shotgun you earn from the Passing the Torch treasure hunt. It also appears in the Lost Between Worlds DLC, which adds a Blue Fractured version.
A close-range shotgun for clearing tight spaces. Blast shells give it extra punch against groups, and incendiary shells set targets alight.
Complete the Passing the Torch treasure hunt. The Blue Fractured version is linked to Lost Between Worlds.
1887
The 1887 is a lever-action shotgun with a seven-shell tube that you can extend to ten. It deals solid close-range damage but works the action slowly, so it rewards careful shots over panic fire.
1887 Sawed-off
The 1887 Sawed-off is a cut-down lever-action shotgun built for hip-fire at point-blank range. FND Vanguards, Engineers and Special Forces Snipers carry it, and Rodolfo Claudia's insurgency rewards its unique Bases Loaded version.
KSG
The KSG is a semi-automatic shotgun with a 15-shell capacity, so you can keep firing in a close fight. Buy it from Juan's arms dealers, or get its unique Excavation Execution from The Long Drop treasure hunt.
M133
The M133 is a pump-action shotgun that can drop most unarmored or lightly armored soldiers in one close shot. El Rubi is its unique version, built by a Yaran furniture maker.