You need permission of the owner of the guns, and to be accompanied by an adult if you are a minor. My grandchildren have attended gun shows with me at age 10, and (with permission of the seller) examined and held different firearms.
There are several Bluebooks on Firearms available in bookstores. Try the "Standard catalogue of firearms" or one similar to it.
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locate any "Catalogue of Firearms" Book in a bookstore. This will give you a start.
Try the blue book of firearms value or call browning
Under the US 1968 Gun Control Act, you must be 18 yrs old to purchase a rifle or shotgun from a dealer. You must be 21 to buy other firearms, such as handguns.
Republic Act 10591, the new gun law, requires that you be 21 years old.
Take the guns to a gun shop or a sporting goods store, or take them to a gun show. Another option: if it is a gun you legally own, and you are in the U.S. you can sell the gun to another person without going to a gun show or gun store, and it's perfectly legal in moststates. Be sure to check your local state laws first.I would consider consigning them with an auction company that specializes in firearms. For example www.rockislandauction.com will take one gun or an entire collection. Their specialist will research each gun to determine its value, they take professional photographs and market your firearms in catalogs and on their website. They know all the laws with regards to selling and shipping firearms. That is your best bet to get top dollar instead of just selling them in the newspaper or to a gun shop, that may or may not be honest. Rock Island Auction sells millions of dollars of firearms each year, and by consigning them they get a percentage so they have a vested interest in getting you top dollar.
Blue Book of Gun Values, Standard Dictionary of Firearms
You need to consult with a lawyer familiar with firearms law.
gun show, gun shop
Old gun catalogs, library, gun shows, gun shops, Blue Book of Gun Values, Standard Catalog of Firearms.
Library, appraisal, old gun catalogs