Here is a copy of the shipping instructions I received from SIG by email:
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"Dear Xxxx,
Thank you for registering for the SIG SAUER P320 Voluntary Upgrade Program. At this time, we are ready for you to send in your pistol to have the upgrade enhancements performed. You will receive a separate email in the next hour with a FedEx 2nd Day Air shipping label to return your pistol directly to SIG SAUER. Simply follow the instructions below.
Your RMA # is XXXXXXX for serial number XXXXXXXXX.
Please send only this pistol at this time. If you have registered additional P320s, you will receive separate emails, RMA numbers, and labels for those pistols.
Please record this RMA number for your records. Once received at SIG SAUER, the turnaround time to ship it back to your home is 4-6 weeks.
SIG SAUER Policy requires that the firearm(s) be shipped back to your residential address. We will not accept any business address for any reason.
The address that we have on file for you is:
XXXXX XXXXX
XXXX XXXXXXXXXX XXX.,
XXXXXXXXXXX, XX XXXXX
4 Steps for Sending in Your P320:
Verify the address above it correct. If it is incorrect, STOP and please call Customer Service at 603-610-3000, Option #1 to update your address. If the address is correct, continue to Step 2.
Please pack up the unloaded gun(s) in a case or box and secure it inside another shipping package. The original SIG SAUER pistol case is preferred. Remove ALL other items from the case including magazines. DO NOT SEND MAGAZINES OR ANY ACCESSORIES (a SIG Romeo 1 on an RX model is acceptable to ship). Please also send back any 320 caliber exchange kits for upgrade (without magazines).
Print out the attached document (.pdf) and include it in the box with your gun.
Print out your FedEx shipping label from the separate email and attach it to the package. Be sure all label information prints out on the paper clearly, and take the package to your main FedEx shipping hub/terminal. They will ship it to SIG SAUER on your behalf. Most retail locations such as Kinko’s or Mail Boxes Etc. do not ship firearms.
To track and confirm delivery to our facility, please go to:
http://www.fedex.com/Tracking. The tracking number is on your label.
After the upgrade has been completed, your pistol will be returned to you via FedEx. An adult signature will be required upon delivery. You should receive an automated email with a FedEx tracking number letting you know when it is shipping back to you. Remember to check your SPAM folder.
**Please read all important notes below regarding the shipping of your firearm**
BEFORE YOU SHIP YOUR P320, PLEASE:
*CHECK & CLEAR your firearm and pistol case of any live ammunition.
* CHECK AGAIN
* All after-market accessories or parts MUST BE REMOVED from the gun and/or case prior to shipping. This includes lights, lasers, and aftermarket triggers.
SHIPPING:
*Please plan ahead. It is the responsibility of the customer to make provisions for return delivery.
*Firearms CANNOT be shipped directly to or held at a FedEx location for pick up.
*Your shipment will be insured through SIG SAUER and not the carrier.
*The service request & label will be active for 90 days from the time it is set up. If the service order & label are not used within 90 days, the service order will be cancelled.
* Do not lock the case or firearm
* Please be aware that any photos, media, letters, receipts and/or fired shell casings included with the gun may not be returned.
We look forward to upgrading your SIG SAUER P320 pistol and will work to get it back in your hands ASAP.
Thank you for choosing SIG SAUER"