On Alec Baldwin’s Shooting

We recently learned that Alec Baldwin is being charged with involuntary manslaughter for his accidental shooting on a movie set. I don’t know the details of the case, nor the intricacies of the law, but I have a question about movie props.

Why was an actual gun used on the set? And why were actual bullets used on the set? Why wasn’t it a fake gun: plastic, or metal without a working barrel? Why does it have to fire blanks? …

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