Huh, this decision seems to have parallels to HB40 'anti ghost gun' law the VA gov just signed. It has long been an American tradition that people can build their own guns at home for their own purposes. This law basically makes it so you have to get an FFL before you are allowed to manufacture firearms in order to experiment and iterate the science involved or run the risk of the Feds claiming a block of untouched plastic is a ghost gun because their master gunsmiths and 'readily convert it' to a firearm with a mere 72 hours of work.

Heck, technically, this makes the traditional potato cannon illegal too and classifies that as an illegal ghost gun. It has no serial number, it's made of plastic, it operates by propelling a projectile through expanding gas...

Similar arguments made in this decision against making at-home distilleries could be applied to at home gun manufacturing as well. "Writing for a three-judge panel, ​Circuit Judge Edith Hollan Jones said the ban actually reduced tax revenue by preventing distilling in the first place."