The above gun isn’t exactly what I’d call lethal. But you’ve got to give YouTuber North Bank credit for his (?) ballistic handiwork. I’m a big fan of home-built guns, especially potato guns (which can be lethal). Especially for [supervised] young ‘uns. Manufacturing a home-brew gun is an excellent way to go-hands-on with science. They also prove the point that you can’t stop the signal. Given the simplicity of firearms construction — updated with 3D printing — gun control legislation can’t stop bad people keeping and bearing arms any more than the War on Drugs can stop drug dealers dealing drugs. When you hold a home-build gun of any stripe, you know that’s right.