Don't know why you guys are all upset. This is copied from the UPS website: Note: Receivers or frames of a firearm are considered *firearms* and are accepted for transportation only if shipped in accordance with UPS’s requirements for shipping firearms; firearm mufflers and silencers are not accepted for transportation.
No where does it say they won't ship a suppressor.
Well here is the way it is worded in the OP link's article.
The following excerpt appears on UPS.com:
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 are considered *firearms* and are accepted for transportation only if shipped in accordance with UPS’s requirements for shipping firearms; firearm mufflers and silencers are not accepted for transportation.)