Well, the ATF/Solicitor General's office have really stepped in it with their briefing in this case. They had to submit a mea culpa letter to the Supreme Court in the frames and receivers case that is going to be argued this term. A mea culpa letter is a that a party must submit to a court in a situation where, as in this case, they have made a material misstatement of fact or law. In the Vanderstok case, the ATF through the Solicitor General's office put in their brief that the parts kit that was classified as not being a firearm in 2017 was a different product from the parts kit that was re-classified as a firearm by the ATF in 2020. It's not a good look for the ATF and it will really call into question at oral argument all of the factual assertions made in their briefing.
