This site has a buy and sell. The issue you are going to have is "Trader Rating". If you do not have a trader history selling is going to be tough to do on line with remote buyers. You do have the option to deal with guys with extensive trader ratings, send the gun to their registered transfer agent and get paid on arrival at the transfer agent. Local guys will be fine because they are face to face. Gun show is another face to face option or consign at local gun shop, or sell at auction are going to be your main options.