According to the NSSF newsletter UPS is no longer shipping suppressors …
NSSF this week learned that UPS had changed its policy regarding the shipment of suppressors. The new policy states that UPS will no longer ship suppressors, even between licensees. NSSF is working with UPS executives to determine what prompted the enforcement of this unwarranted policy. We are unaware of any thefts or losses that would explain the shipping company’s sudden decision to enforce a prohibition against shipment. NSSF will keep you apprised of developments. Separately, NSSF is also working with the U.S. State Department to achieve a policy change to allow export of suppressors.
<sarcasm> I expect they will soon also ban shipments of car mufflers, oil filters and plastic soda bottles. </sarcasm>
Only a fool fears a metal tube.