Earlier quoted context omitted.
"If the USA implemented all of Switzerland’s gun laws, a citizen who passes a background check would be able to buy a newly-made full-automatic machine gun that is not allowed in the US outside of law enforcement or military." There are several things wrong with the above statement ... First, in many (most) states of the United States, you can indeed purchase a fully automatic weapon / suppressor / grenade launcher /…
I like most of your answer, but didn't like that you silently dropped "newly-made" from the OP's criteria. You're welcome to argue that it doesn't matter, and just as welcome to argue that this is a good thing, but it seems odd to avoid mentioning that there is no legal way for a US citizen to purchase a fully automatic weapon manufactured after 1986 --- and that guns not subject to this ban are in very short supply…
For the sake of argument, however, a brand new rifle chassis mated with an RDIAS seems to fit the bill, yes ?