You forgot to also add that regular people cannot do all that because they also need to be a FFL

No, I didn't, because, no they don't.

If they're manufacturing automatic weapons or wish to purchase an automatic weapons manufactured after 1986 to law enforcement, THEN you need a class 3 FFL license. If they're manufacturing, then they also need to file a form 1.

Private individuals can purchase a machine gun without an FFL, assuming your state law allows it via form 4. An FFL makes the process easier, but it's not a requirement