My father has a very nice and well kept over under 12 ga that is labeled s686 perdiz. As far as i can tell the used beretta s686's sell for about $1500 dollars. Our problem is we wanted to trade it for a couple rifles, the local gun stores are giving us the run around. So do any of you have suggestions of where and how to sell it to get the most value, and also how to look up exactly what this gun is and how much it is worth?