Last time I shipped I used
Ship My GunShort of having a local shop do it for you, I don't think any of the carriers will allow you to ship a firearm, let alone a handgun anymore. I used to ship rifles from the UPS Customer Service Center off I-25/Comanche, but I can't even do that now.
"UPS accepts packages containing Firearm Products for shipment only as a contractual service and only from Shippers who are licensed importers, licensed manufacturers, licensed dealers, or licensed collectors (as defined in Title 18, Chapter 44 of the United States Code) to authorized recipients, as outlined in the approved UPS agreement for the transportation of Firearm Products."