And that was just one video of several.

A gun is just a pipe and a striker. And anyone who can read will have enough sense to know that the shell can't be the latest high-energy type (which could shatter the pipe), but the cartridge must be filled with suitable loads (I thought anyone with high-school chemistry would know how easy it is to make old-fashioned gunpowder from readily available materials).

Bombs are incredibly easy to make.

Restrictive laws only discourage the sane.