There's a growing number of guns being converted into machine guns. Here's why it matters: When someone opens fire with a machine gun, it has the ability to cause more damage, and impact more lives.

Laws will not stop every tragedy - but a Glock switch ban can save some lives. Therefore, we must take action. Phillip Ensler ...

So-called switches, which turn handguns into automatic weapons that can fire 20 bullets a second, are "beyond terrifying," Judge Iain Johnston warns.