I suspect most insurance companies would agree that losing 1 set of barrels from a 2 barrel set on an expensive double would certainly devalue the gun. However; I doubt that would consider it a total writeoff since you still have one set.
You're going to have to figure the additive value of the second set of barrels and insure them accordingly.
As an aside: Forest Gump was right about S**T Happening. I sent a package by USPS Registered Mail over a month ago and it's still missing. This is considered by most to be one of the most reliable and secure ways to ship items.
Jim
