Earlier quoted context omitted.
You can purchase firearms for cash from many dealers (at gun shows) without either a background check or a paper trail.
Not true. If the purchase is from an actual dealer with a Federal Firearms License then a 4473 (ATF form) must be filled out and an accompanying background check will be made. If the purchase is between two non-dealers then there is no requirement in many states for a background check or paperwork, so long as both are residents of the same state the transaction occurs in. However, all new guns are (since 1968) purcha…
My understanding is that there is technically an exception to this where you can manufacture your own firearms so long as you stay under the yearly limit and do not manufacture them with the intent of distributing them. Once you have done so, you can then distribute them as a private citizen.
That reads weird because the legality of distributing it depends on if you can assert that distribution was not your intent when you made it. This means this is probably not a very practical exception, as it potentially involves you arguing something rather nebulous in court.