I'd mail it to myself or to Crossman as Walt suggests and have them fix itup and then return it to you at your home address.

No problem mailing the airgun:
http://pe.usps.com/text/pub52/pub52c4_008.htm

Read through the regs,,several references to airguns and their mailability.


They've changed the regs slightly recently and removed airgun from their general 'firearm' deffinition and given it its own.
A stroke of genius....

Bring a copy of the regs to the PO with you, you never know what mind-set will be behind the counter.

JMHO