You can ship anything you want via UPS OR Fed-EX. Handguns must go Next-Day.Is that a California restriction to only use FedEx I'm not aware of?
Guns are regularly shipped through UPS from individuals who send them to others going through our FFL and from our UPS station all across the US to other FFL's by customers as well.
You cannot ship handguns via USPS, unless you hold an FFL.
.....but you all ready knew all of that.