When I am shipping guns, I have taken to packing the barrels in a 36 inch long 3" PVC pipe just as PA24 has shown and then putting that into the 36" box I pack the rest of the gun in. While almost no packing system is perfect, I believe this method substantial protects the barrels and the rigid ness of the pipe adds to the strength of the box the whole gun is packed in. It's adds a couple bucks to my shipping costs.

The world cries out for such: he is needed & needed badly- the man who can carry a message to Garcia