The safety protocols used in the industry that were developed with the assistance of the NRA remove the actor from the chain of responsibility for ensuring any real firearm used as a prop is safe to handle. While they were an improvement over prior protocols and practices, I don’t see how they actually hold any legal weight with regard to culpability for anyone’s actions. The NRA isn’t a government body that has the ability to absolve anyone of responsibility or grant legal immunity as long as someone follows the rules they set forth.
Regardless of the outcomes here, I suspect the industry is going to have to develop new protocols that involves more training of the actors who may handle real firearms as props, and more directly involves them in the chain of responsibility for safe usage and handling.