wow this is the most entertaining thread there has been in ages!
Nutz, you said yourself that you/your team mates are very techy, so why not fix the gun yourself? Rather than sending the gun back to him, would it not have been much easier to just ask for a replacement noid?
As Robbo and others have said, there is about as much chance of this going to court, as there is my grandma remembering my name for more than 2 seconds (i.e no chance). It's your problem that you did not insure the package correctly, the package was not signed for, so there is no proof of delivery (RM saying it's delivered is not proof without a signature) and therefore, in conclusion, i believe you are...... not only up sh!t creek without a paddle, but i think your boat just sank too