I do not even know where to begin. You are clearly just trying to waste my time with stupidity. Dummy rounds are on sets all the time. Real guns are on sets all the time. Even fully fireable bullets are on sets all the time.
No, not really. Just trying to give you a little understanding of firearms and ammo. Believe what you want, but it's the person handling the firearm to ultimately make sure it is safely used. Period.