We never used UPS for shipping, knowing that the company has anti gun tenancies. We used FedEx exclusively for 5 years or so. About a year ago they started refusing to deliver international shipments. Then a couple domestic issues. We now use USPS exclusively. No issues here so far for the last year or so.
I think shipping is the way that "they" will try to control the firearms industry. If shipping companies decide they will not deliver firearms related products as a company policy, it would not be an infringement on the second amendment by the government. If this was to happen our industry would be limited to trucking and brick and mortar stores. Couple this with the internet providers deciding to ban communications related to firearms products and our industry will be crippled. All done without legislation and no infringement on our rights.