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It depends. Blue book is the standard for ease and fairness if you have nothing else to go by. It does not however accurately represent the market at a given time/place. Prices in MA are inflated for rare items and really nice pieces that are not on the list. Gunbroker has the potential to draw higher prices on that stuff as well because you got a nationwide audience and you have collectors with plenty of cash to bid the highest prices, virtually wiping out your average prices. So it really depends on the gun. I'd say if it's nothing special or out of the ordinary just have a look at the book and see what folks around here will offer you.
Jeeze louise, I've got to get to bed. It's appalling how easy it is to fritter away time online.