by 
Chief sir
ANSWERS: 2
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gunbroker.com
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There are a few Web sites like http://www.gunsamerica.com and http://www.gunbroker.com that can give you an idea. Books are also available such as the Blue Book of Gun Values, Standard Catalog of Firearms and the Gun Trader's Guide which can also help. What it comes down to is the piece your interested in, its condition and availability. A reputable gun shop or trusted broker can also be valuable.
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