Reply #66: I still call it a loophole

[RamboLiberal]

A loophole is a weakness or exception that allows a system, such as a law or security, to be circumvented or otherwise avoided. Loopholes are searched for and used strategically in a variety of circumstances, including taxes, elections, politics, the criminal justice system, or in breaches of security.

http://en.wikipedia.org/wiki/Loophole

IMHO then it can be a breach of security or the criminal justice system that the person obtaining the gun is not lawfully allowed to own the gun. There are cetainly other private transactions that are not allowed by law because the goods in the transaction may be unlawful or may be a danger or security breach without proper procedures being followed. For instance I wouldn't be allowed to legally sell you my prescription oxycontin. (and no I'm not taking oxycontin).