All you people who keep saying,
"Screw the cops!"
and
"there's no legal obligation to keep records or turn those records over to cops" are being very shortsighted.
BIG PICTURE: taking a selfish attitude & being a dick like that during a murder investigation is likely to cause the government to pass laws banning private sales of guns, making all sales of firearms go through an FFL, and making all of those FFL records available to cops without a warrant.
"Screw the cops!"
and
"there's no legal obligation to keep records or turn those records over to cops" are being very shortsighted.
BIG PICTURE: taking a selfish attitude & being a dick like that during a murder investigation is likely to cause the government to pass laws banning private sales of guns, making all sales of firearms go through an FFL, and making all of those FFL records available to cops without a warrant.