I live in a state that permits NFA-regulated firearms. I understand that, because I am under 21, it is unlawful to purchase an SBR through an FFL licensee, or basically a dealer. In order to purchase any firearm or firearm parts online, they almost always must go through a dealer. I understand that it is legal, however, to create and/or purchase an SBR from a non-FFL licensee. Basically, this means that I can create an SBR or purchase an SBR from an in-state resident. I do not know of anybody from whom I can purchase a complete SBR. This leads me to the creative option. If I can, I will purchase the parts through a dealer. So now to my question: Can I purchase a complete SBR upper receiver and complete lower receiver as two separate parts from a dealer? I have heard that the lower receiver must be registered as an SBR, but does that mean I can purchase this lower receiver and register it as an SBR from a dealer? If I can't do that and am forced to find & purchase a lower receiver from a non-FFL licensee in-state resident, and then submit an ATF form 1 without going through a dealer, can I still purchase an SBR upper receiver through a dealer since the upper receiver is not in-and-of itself an SBR registered component? This possession of the upper receiver would be void of constructive intent because I would purchase the upper only after I have purchased and SBR-approved a lower receiver. Very confusing, yes, but I am desperately looking for an answer! Thank you!