Not to slaughter your comment, but the guns that guy used were and are not capable of firing 800 rounds per minute. Don Young is absolutely correct, these bump stocks can easily be created with little effort at home. There are literally 100's of YouTube videos that show how to make one with items easily purchased at a hardware store. The fact is, if someone is set on being this evil, they will find a way, guns or not. We should be focusing on identifying mental illness, i.e. The threat, not the tool!