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Probably to try and muddy the water for the jury and public opinion. The right wing always seem to do it when someone's been a victim of an attack by one of their own, dig up shit from their past and if there isn't then just make it up. In this case I'd imagine they would try and say all the kids at the school were delinquents and it's not the gun manufacturers fault cos the bad kids would have found any way of causing havoc.
That said it could just be a punishment subpoena, I wouldn't be surprised if they're just fucking with the people suing them. More billable hours for the lawyers too.
"Remington previously responded to a discovery request for its internal company communications by producing more than 18,000 unsorted files containing memes, cartoons, and ice bucket challenge videos."
As part of a lawsuit defense, the company that made the guns used in the Sandy Hook shooting demanded the disciplinary and attendance records of dead children.
https://www.vice.com/en/article/akgpdg/remington-subpoenas-report-cards-of-five-children-killed-in-sandy-hook-shooting