Link here. The case is new, and involves the manufacture of guns by a private citizen wholly within a single state. He was convicted of violating federal laws, even though the state itself, Kansas, had recently passed a law that specifically outlawed federal prosecution for anyone “owning firearms made, sold and kept in the state.”
The only federal challenge to the constitutionality of National Firearms Act to date was U.S. vs Miller in 1939, which was uncontested when neither the defendant nor his attorney showed before the federal court. As a result, we’ve never had these federal gun laws challenged on the fundamental level.
If Cox and Kettler’s attorneys see this challenge through the courts, we can expect it to arrive before a U.S. Supreme Court in several years time. It will be a high court shaped by the 45th President of the United States, Donald Trump, and the organization that spent more money than any other to help him win the Presidency, the National Rifle Association.