Okay.
Joe Blow shipping a handgun to manufacturer or licensed gunsmith via UPS or FedEx=Okay; follow the carrier's individual rules, e.g. use Next Day, and so on.
Joe Blow shipping a handgun to DT McShakeyhands, whether in or out of state=No, under any circumstances.
Your local laws may be tighter with regard to shipping to a manufacturer or gunsmith. Example: it may have to go through a licensed dealer for both trips.
Edited to correct inaccurate information.
Joe Blow shipping a handgun to manufacturer or licensed gunsmith via UPS or FedEx=Okay; follow the carrier's individual rules, e.g. use Next Day, and so on.
Joe Blow shipping a handgun to DT McShakeyhands, whether in or out of state=No, under any circumstances.
Your local laws may be tighter with regard to shipping to a manufacturer or gunsmith. Example: it may have to go through a licensed dealer for both trips.
Edited to correct inaccurate information.