I have no doubt that what dpsix claims is true. And I realize that if you don't tell the shipper what's in the package, you may ship it via UPS & Fedex using any service they have.
Here is a quote from UPS website.
Red highlites are mine.
"Shipping Firearms
Special Procedures for Shipping Firearms
Use These UPS Services for Your Firearm Shipment
UPS accepts packages containing firearms (as defined by Title 18, Chapter 44, and Title 26, Chapter 53 of the United States for transportation from and between licensed importers, licensed manufacturers, licensed dealers, and licensed collectors (as defined in Title 18, Chapter 44 of the United States Code), law enforcement agencies of the United States (or of any department or agency of the United States), law enforcement agencies of any state or department agency (or political subdivision of any state), from and between persons not otherwise prohibited from shipping firearms by federal, state or local law, and when such shipment complies with all federal, state and local laws applicable to the shipper, recipient, and package.
Handguns, as defined by
18 U.S.C. § 921,will be accepted for transportation only via UPS Next Day Air Services, specifically, UPS Next Day Air® Early A.M.®, UPS Next Day Air®, and UPS Next Day Air Saver®. (Note: UPS Express CriticalSM Service is not available for firearms).
UPS accepts firearm parts for shipment, provided the part is not a "firearm" as defined under federal law; the contents of the package cannot be assembled to form a firearm; and the package otherwise complies with federal, state, and local law.
(Note: Receivers or frames of a firearm, firearm mufflers and silencers are considered "firearms" and are accepted for transportation only if shipped in accordance with UPS's requirements for shipping firearms.) UPS does not accept automatic weapons, including machine guns, for shipment.
Firearms (including handguns) and firearm parts are not accepted for shipment internationally.
UPS ReturnsSM Services are not available for packages containing firearms.
Follow These Packing Requirements
Packages containing handguns must be separated from other packages tendered to UPS for delivery.
All firearms are to be shipped in new corrugated packaging which meets the UPS Single Wall Box Strength Guidelines. Medium and large UPS boxes may be used for smaller shipments being shipped via UPS Express service.
All firearms are to be packaged in accordance with UPS Packaging Guideline Specifications.
Ammunition must be shipped separately from packages that contain firearms (including handguns).
Ammunition will be transported only when packaged and labeled in compliance with 49 C.F.R. § 172 regarding hazardous materials shipments, and must be shipped in accordance with the UPS Guide for Shipping Ground and Air Hazardous Materials.
About Documentation and Labeling
The shipper must use Delivery Confirmation Adult Signature Required service for each package containing a firearm, including a handgun, and affix a UPS label requesting an adult signature upon delivery.
The labeling and outer box markings on all firearms shipments should not identify the contents as containing a firearm. Labeling, including the shipper's and consignee's abbreviated names on the shipping label or air shipping document, must be non-descriptive.
Getting Your Firearm Shipment to UPS
Firearms (including handguns) may be shipped only through a UPS Scheduled Pickup Account (specifically, Daily Pickup, Daily On-Route Pickup, UPS Smart Pickup®, and Day-Specific Pickup), or through a UPS Customer Center (counters at UPS operational facilities). Note: Firearms (including handguns) are not accepted for shipment via, UPS Drop Boxes, UPS On-Call PickupSM, or at locations of The UPS Store® or any third party retailer.
When you are shipping a package that contains a handgun, you must verbally notify the UPS driver or UPS Customer Center clerk.
See the terms and conditions in the UPS Tariff/Terms and Conditions of Service for information regarding firearm shipments."
Excerpt from 18 U.S.C. § 921 as referenced from UPS:
"(3) The term “firearm” means
(A) any weapon (including a starter gun) which will or is designed to or may readily be converted to expel a projectile by the action of an explosive;
(B) the frame or receiver of any such weapon;
(C) any firearm muffler or firearm silencer; or
(D) any destructive device. Such term does not include an antique firearm"
"(29) The term "handgun" means -
(A) a firearm which has a short stock and is designed to be
held and fired by the use of a single hand; and
(B) any combination of parts from which a firearm described in
subparagraph (A) can be assembled."
The trick here is to make UPS happy. If you claim your package contains machine parts or something other than a handgun and you want insurance on your delivery, UPS won't honor the claim for loss because you didn't tell them it was a handgun. UPS doesn't have their own definition of a handgun. They use the definition of US Code.
So, Magnaport is wrong! A handgun less cylinder is still a handgun. You must tell them it's a handgun and you must ship via one of their overnight services if you expect them to honor any loss insurance claims. If you don't care about insurance then ship it any way you want and don't tell 'em what it is.
BTW, FEDEX policy is exactly the same.
UPS: Shipping Firearms
18 U.S.C. § 921 : US Code - Section 921: Definitions