And it works almost 0 times

Hey in our defense, it’s a pretty good solution

Can confirm. My grandfather built several devices for killing gophers. They were placed at the top of their holes. When the gopher popped out, it would push a rod that would release a spring-loaded pin, firing a shotgun shell from a short length of steel pipe.

Gophers travel above ground most often at night, so sleeping at my grandparents' place often included surprise nocturnal ammunition discharges.