The owner of the prop company that provided the guns and blank and dummy ammo, PDQ arms, Seth Kenney.
HGR publicly blamed that company and sued the owner, claiming that they mixed live rounds with the dummy ammo. But it's come out that HGR asked the owner of PDQ about shooting live ammo through the prop guns and was told not to. And supposedly forensic tests excluded the live ammo found on set from anything possessed by PDQ. The lawsuit was either dismissed or dropped when the owner of PDQ did a FOIA for documents related to the criminal case and was accidentally sent HRGs full cell phone dump. Which contained texts between her and her lawyers and allegedly contains texts between her and her dad where he tells her to 'find those rounds' or words to that effect.
And the owner of PDQ is a prosecution witness who is apparently prepared to testify that HGR told him that she bought live ammo of the same caliber to shoot from her personally owned gun. From what I've read, Seth Kenneys testimony will be that HGR asked him if she could shoot live ammo with the prop guns and after being told no, responded that she bought some live ammo and owned a pistol of the same caliber that she was going to use it in.
Which begs the question, if you have your own pistol, why ask if you can use one of the same model and caliber rented from a prop company for nonwork live fire?
This sort of confirms the early stories/rumors of HGR letting some of the actors "practice" shooting with live ammunition. JMO, she was inexperienced and immature enough to think it would be a good idea for people on set to entertain themselves by target shooting using live ammo with prop guns.
The fact HGR discussed using live ammo in the prop weapons with PDQ kind of puts the fault on her. It's hard to accuse the production company of causing the accident due to operating an unsafe set when HGR was actively considering using live ammo in prop guns just for fun. JMO