How can the Blue book place an accurate value on a firearm that is rare and seldom comes up for sale. For modern firearms, values are easy. There is retail and then you subtract dollars based on condition. I have used the book many times as a guide for values, but it is no "bible". I have a firearm that has only come up for sales on-line 28 times in the last 10 years. Ten years ago it sold for almost double what the book says it is worth today. And continues to go up more recently. So..... how can you have a book listing values when there is so little information to compare it to? When I sell an antique or rare gun, I do a ton of research, not only on gunbroker but private auctions and other sites. That seems to be a more modern accurate estimation of value to me. What do you guys think?