“If you’re capable of memorizing 120 pages of dialogue, you can memorize four lines of gun safety,” special effects and firearms expert Steve Wolf tells The Post.

“If that scene required him to put the gun to his head and pull the trigger, I’m sure he would have taken a look inside the gun. Wouldn’t you?”

As a producer on “Rust,” Baldwin could be held culpable for the cost-cutting, chaos and eventual hire of a young head armorer with just one stint in said job on her résumé — because, according to Deadline, multiple other armorers turned it down over low pay and high stakes, with too many firearms to manage.

“They hired someone who was insufficiently experienced,” Wolf says. “If he’s the producer, the buck stops with him.”