Perhaps ask a Class 01 FFL holder to ship it USPS.
A small Class 01 FFL fee at the sending end may contribute less to the total cost of shipment via the other carriers.
I'll check the other discussions, but I think that the USPS rules for C&R to C&R are still not clearly understood. This has resulted in permission to ship being granted by individual postmasters. If this is wrong (and has been updated since I last checked the discussions), apologies.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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