It has been a few years, but last time I sent a pistol:
You can send it anyway you like, except by US Mail; only an FFL may use the mail.
FedEX and UPS have rules about having to overnight ship it. But those are company rules, not laws.
So, you can follow the rules or not, that is for you to decide. But, you must follow the Laws.
Like I said, it has been a few years. Call the UPS or FedEx to find out for sure.
Or use an FFL to send it through the Mail system.
You can send it anyway you like, except by US Mail; only an FFL may use the mail.
FedEX and UPS have rules about having to overnight ship it. But those are company rules, not laws.
So, you can follow the rules or not, that is for you to decide. But, you must follow the Laws.
Like I said, it has been a few years. Call the UPS or FedEx to find out for sure.
Or use an FFL to send it through the Mail system.