Franchi SPAS-12
Porter and his Franchi SPAS-12
The Franchi SPAS-12 was a combat shotgun used on Earth in the late 20th century.
In 1996, Porter, a member of an anti-government militia in Arizona, wielded the Franchi SPAS-12. He held Chakotay and B'Elanna Torres hostage by pointing his shotgun at them. Later, he fired the weapon at The Doctor before he was stunned by a phaser. (VOY: "Future's End, Part II")