gunbroker?

Has anyone tried selling a gun on gunbroker? or is there a better place to try? My wife wants to sell her shotgun to buy a sewing machine... and would like to get a fair as price as possible as we paid 1600 for it, and hoping to get 1100 or close to it and i doubt a gunshop would give that, or is there a better place to try? thanks guys!

What about the newspaper or a gun show?