As I’ve read, the double check is normal protocol....which may have been compromised with the replacement non-union peeps, but even here, the AD announced “cold gun”—indicating OK to proceed—and that gun had previously been prepared by someone else.
One of the two—or both—failed protocols.
And it still comes down to everyone who picks up a firearm should be required to inspect it.
Everyone involved in the movie industry must take a mandatory gun safety course every three months delivered by the NRA....