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.
It is a strong room-clearing gun. The semi-auto action and large magazine let you keep firing without stopping to reload. Its kick is strong, so stay at close range.
Buy it from Juan's arms dealers or the Guerrilla Garrison, or loot it from FND chests. Excavation Execution is the reward for The Long Drop treasure hunt.
The 1887 hits hard but cycles slowly from a 7-shell tube. The KSG gives you more shells and quicker follow-up shots.
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.
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.
RMS-18
The RMS-18 is a rank 4 shotgun with a 12-shell magazine, so you can keep firing longer than with most shotguns. You can buy it or loot it from FND chests.