and it's just not done. >> now, the blanks that are typically put in actors' guns, they make noise. they light up. smoke. nothing comes out. but to a layman, when you look at a blank, can look like a live round. you have here a blank and a live round. explain the difference. and what -- what the difference is between them. >> okay. this particular round right here is actually a dummy cartridge. but we're going to use it as an example of a live round. >> this is what a live round would look like? >> this is what a live round would look like. and so, you see that we have a cartridge case. typically, that's full of gun powder. there is a primer case or a primer cap at the bottom. and this right here is the projectile or the bullet. that is what would leave the shell casing, and get propelled downrange in a live cartridge. >> and this? >> this right here is the modern crimped theatrical motion picture blank. and you can see that it's simply a shell casing. there is a primer cap at the bottom. but there's no projectile. it's simply crimped over and