Features of the new 40th Edition Blue Book of Gun Values: *Includes all the new 2019 makes and models, along with important pricing updates on many current and discontinued models. *For the first time in decades, many values on collectible firearms, especially AR-15s, have gone down significantly - this new 40th edition carefully tracks this recent trend. *2,512 pages are included on nearly 1,700 manufacturers/trademarks, with almost 30,000 gun model descriptions, and over 180,000 values! *Over 45 pages of extensive serialization information is available allowing year of manufacture to be ascertained on many makes/models. *The Photo Percentage Grading System (PPGS) has been updated to accurately grade all pistols, revolvers, rifles, and shotguns based on percentages of original condition.