I recommend checking what people have paid on Gun broker.
How to do that--log in to Gunbroker. Click on "advanced" in the top right corner. Click on "completed items" tab close to the top. Enter your search parameters. You will have to look through the list to see if anyone even bid on the item. You must have a gunbroker account and be logged in to do this. If there is a bid you may need to look at the individual item to see if it met the reserve and was actually sold.
I am not sure it is worth as much as you may have been lead to believe.