The Lever-Shotgun is a weapon which appears only in Thing Thing Arena 3.
The Lever-Shotgun has 7 shots. Like most shotguns, it is best at close range. It can be dual-wielded to increase its clip size to 14 shots while also increasing its fire rate. Getting 50 kills with the Lever-Shotgun grants the Shove it up their nose and pull the trigger! achievement, and getting 100 kills while dual-wielding it obtains the Hasta la Vista achievement.
The lever shotgun appears in the intro video of Thing Thing Arena 3, where 154 shoots few shots while inside a sports car before throwing it at his pursuers.