I've seen your posts, but all I could see regarding actora was that actors have final responsibility. I couldn't see anything about how you make sure actors are qualified to even check the gun is safe.
Movie sets hold safety meetings for all those who are handling firearms on set. Sometimes multiple times a day. With the movie Pawn, 90% of it was shot at night. We filmed from 11pm to midnight to about 4-5am every single night.
The 2am to 4am time slot were the brief outdoor scenes since most of it was shot in a diner. Actually, and old Friendly’s ice cream and food restaurant that were popular in the Northeast. Converted for the film.
We held safety meetings each and ever day when there were firearms to be used. The actors and crew were all present. In between each take, the actor and extras handling the firearms were there to dry fire, and then to watch the loading of the firearm before hit off to them. Checks and balances.
Most of the background extras were handed rubber Glocks, and the real local law enforcement SWAT members used as extras in the outdoor scene had sniper rifles work the firing pin removed.
Actors are not ignorant to this on set. They are every bit a part of those meetings, trained if needed, and present for the loading and exchange. These rules were put into place post The Crow with the Brandon Lee accident.
Alec Baldwin is NO AMATEUR, he has been in many films where firearms have been used. What does seem concerning, was that many workers complained about the lack of safety standards around the firearms on a film he is producing, and have walked off the set due to that.
With all of this said, the universal standard is to NEVER point a firearm, wether it be a prop gun with blanks or squibs at anyone on the set or in scene. You use camera angles and cuts to make the viewer think that’s what happens.