It's actually interesting to met that, in the American discourse, we never discourse an EU-style classification system. Whenever people in the US propose new gun regulation, it always a maximalist approach -- banning the AR-15 completely.
The European system, broadly speaking, is not like that.
There are federal classes for dealers and manufacturers -- manufacturers of silencers, of automatic weapons, of missiles and rockets, &c, and dealers of these articles -- but that also is not like the European classification system I am talking about, which is for end users.
The NFA, which does apply special regulation to silencers, short-barreled rifles and some other items, which allows them to be owned by end users, and that is kind of similar but there is a real difference: you file for a tax stamp and wait for a background check to complete, without having to worry about taking a particular course and getting a certain grade.
The dude showed of this EU compliant collection.
Multiple pistols and rifles, and what some state would classify as weapons of war, an SBR, or a assault weapon.
All obtained legally via permits and a local cop signing off on the paperwork.