>> the gun we're going to use is inside here. this is the single action revolver. you can see that, at the moment, it's empty. >> reporter: you turn it so we're sure it is empty? >> this particular one has six cylinders. i'll always click it over seven times, just to make sure we didn't miss anything and that you're comfortable with the fact that it is, in fact, an empty firearm. >> reporter: i'm comfortable. this is what a blank looks like. >> cartridge case. there is no projectile. >> no bullet or projectile. >> reporter: it has gun powder. >> it has a primer in it. this is a modern theatrical blank. >> reporter: what looks like a typical bullet is sometimes used, for example, to show a tight shot of a gun being loaded in a movie or tv show. under safety regulations, such a bullet -- >> it's a dumby cartridge.