I have built several rifles from scratch. Got the action, barrel, stock etc... and built one. Then if I didn't like it I would sell it. Kinda like a hobby sort of thing. At what point does it turn from being a hobby to being a business? And more specifically, at what point do I need to get an FFL? Can I build a certain number a year? Is it where I am getting my parts from? Or is it if I am making a profit? Quite frankly, I would prefer to keep it a hobby and I would prefer not to get an FFL. But at the same time I don't want to cross the line and get hung out to dry.