Somebody may have already pointed this out, I’m not going through all the comments to find out. If the weapon origonaly had a S/N and it was removed that person commited a crime. If he sold it he commited a crime. If a person buys a weapon with the S/N revoved they commit a crime. Everything about this transaction was a crime, the fact that it was done over the internet is irrelevant. His son and the person he purchased the weapon from both commited a felony offense.
This is a prime example of why gun regulation will not work.
How does anybody know that it wasn’t Warren’s son who took the serial number off the gun after he purchased it.