CLC58, you are pretty much correct. The FAA does not distinguish between RC models and Drones. They are all lumped under the term "Unmanned Aerial Systems" (UAS). RC aircraft that weigh less than 250 grams are considered essentially harmless unmanned aerial systems and do not need a registration number assigned. Everything 250 grams and over need a registration number. RC aircraft 55 pounds and over also incur operating restrictions that comply with a community based organization and also have flight area restrictions. RC drones (UAS) used under part 107 for commercial purposes require separate registration. You can learn more from the FAA sites listed below. It sounds onerous, but actually is not a complete show stopper. Horrible? Yes, but doable, like taxes. The first link will show you how to register yourself and get a registration number assigned to you to apply to all your models over 250 grams. The second link is actually included in the first link and describes the restrictions.

https://www.faa.gov/uas/getting_started/register_drone

https://uscode.house.gov/view.xhtml?...edition=prelim