Originally Posted by SigKoala
Because it's interstate commerce, the seller is from CA and the Buyer is from NV, as such it is regulated by federal law.
As I posted earlier 18 USC 922 prohibits interstate firearms transfers between non-licensees(FFL holders, C&Rs don't count except for C&R). Which I forget where in 18 USC, it goes over it, but the summary of that is linked in the ATF FAQ, interstate firearms transfers must go through an FFL.
Edit: With the exception of firearms that are inherited.
Oh okay, now that all makes more sense. It's government red tape.