Why not try the Villages Straight Shooters Gun club? They have a web page with a classified section.
Home
There is a place on the home page to ask questions to the gun gurus. They can help. There is also a Bill of Sale you can down load.
Shooters World, Pawn shops etc will give you 50% or less of the guns value. They're a business and what to make as much as possible off the sales. It's much better to sell them yourself. I recently help a lady sell 15 guns after she lost her husband. Send me a pm if you have question on how to do this.