Ah, but consider: Hollywood. They're...different.
I could see this conversation:
BALDWIN: Okay. The unions are doing what they always do, lying, grifting, overcharging, dragging their feet, slowing things down deliberately. We have to kick them out. If we do, though, how can we continue to film? What if we get audited on things like safety and firearm handling, and...
ASSISTANT: Don't worry about that. I know this girl who owns and shoots guns, she has taken all the gun safety courses, she can do this for us at a quarter the salary. Hell, she'll do it for free just to get on the set.
BALDWIN: Does she have any experience?
ASSISTANT: She helped out on a set once, showing the actors how to aim in exchange for their autographs and selfies with them...
BALDWIN: Okay! Let's do it!