Earlier quoted context omitted.
The supreme court, stacked or not, has no bearing over gun ownership, nor does congress. "Congress shall make no law […] the right to bear arms shall not be infringed." supercedes both of them.
>> no bearing over gun ownership Except they have great sway over definitions. They dictate what "arms" actually means. They dictate whether that word includes entire classes of weapons. The court currently protects only guns, but a small reinterpretation of "arms" could easily expand it to include bladed or explosive weapons, both of which are not currently protected. Does the 2nd cover flamethrowers? SCOTUS gets to…
The paperwork required is the trivial part. I have friends that, essentially for a laugh, filed for and received every Federal approval required to acquire basically the entire range of conventional weaponry. It had a similar level of scrutiny as applying for Global Entry at the airport. If you exercised this, you still need to comply with all the industrial regulations that apply to non-weapons with similar properties, which is expensive and inconvenient.