I'm also in the 901. My issue is, I want to buy gun parts for my builds, but I want to build them anonymously, as is my right under the Constitution. Case in point - if you want to buy a barrel for a rifle build, and Classic Arms has them in stock, you can walk right in, plunk down your cash, and walk out with no paperwork on you our your address. But Classic Arms DOESN'T have barrels, nor does anyone else within driving distance. So how do you buy stuff online anonymously? You can use a prepaid visa card, but the shop you buy from is still gonna save a record of who they sold to and your address. I get the idea that we don't want the bad guys to be able to do this. IDK... It's a conundrum.
This is all in the context of all the talk of the BATF creating a national database with those 4473s. Sure, a barrel sale doesn't trigger a 4473, but I recall the BATF raids on that 80% shop in CA a couple years ago. That shop didn't generate 4473s either. Just sales records of all the people they sold 80% receivers to.