The important case will be when someone files a post-'86 civilian machine gun manufacturing permit, gets denied, and files suit. The Brady Amendment outright banned manufacture of new machine guns, and only the ATF's invention from whole cloth of a SOT and law letter process provided a means for MGs to be manufactured and sold to the government. The moment THAT case makes it in front of a court, the Bruen precedent would require either: 1) The law must be followed as written and the government has no way to acquire new MGs. Cue repeal of the Brady Amendment so the military-industrial-conplex can supply its customers. 2) The Brady Amendment is tossed as unconstitutional and civilians can now manufacture new MGs for civilian sale. Either outcome is going to be spicy!