IMHO, it's not worth much more unless the receiver has NOT been modified for the 7th round stoppage problem. I sold my last real gas trap, 54,xxx, rifle for 10K back around 1990.As xdevildog posted - yes - they are rare. From what you posted your M1 was re-barreled in '43 and - I'm guessing - the majority of parts on your rifle are mid-war at the earliest - more than likely being rebuilt 2 times in its lifetime. Most gas traps were reworked as soon as the modified gas system was adopted - early war. That's probably the 2nd barrel yours has had on it. What makes it a "rare" rifle is that a true Garand collector NEEDS a gas trap in their collection - in all reality there were only 50,000ish built - not a lot considering there were more than 3,000,000 built in total. Very few survived unaltered since being built - most "correct" (fake) gas traps you see on the market have new made barrels, stocks and gas piston assemblies. To rebuild it into a "correct" gas trap would be next to impossible - the original barrels were pulled and scrapped - as were the original sight assemblies, bolts, stocks and most other components - upgraded in the field. That being said - it IS worth more than a standard early to mid-war Garand.
Depends on who you are insuring it with. If you are shipping it to yourself through an FFL on Maui by UPS or FedEx my experience has been that asking for any additional insurance on a firearm or labeling anything as an "antique" or "collectible" causes all kinds of grief far out of proportion to what you are asking them to do. Haven't used USPS to ship long guns for a long time, but their insurance should be much easier to acquire.it is in good to very good condition, I will be taking it with me to my home in maui. what should I insure it for? - stan