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In order
1) Get a cardboard tube from the local PO , their about $3 and a roll of bubble wrap for another $3 , wrap the barrel so it fits snug in the tube and put some extra wrap in the ends about 2" thick , tape the end caps well with packing tape .
2) Shipping will depend on were it is going , about $10 to $15 at the most ( Express Mail )
3) Payment works best with a USPS Money Order or if your set up for it PayPal
4) In most cases it is best to wait for payment , but if you have read the persons feedback and feel ok about it sometimes the barrel and the payment will pass each other in the mail .
stimpy