I guess it's fair to say that I've been in the buying/selling game since I was a young lad. Started with bicycles and slot cars then into horses, tack, buggies, and wagons. After I turned 16 cars and motorcycles became my focus. That said I'll mention a few things that I see often on both forums and at gun shows and even some gun shops. First thing CLEAN your gun. I can't believe how many guns or photos of guns I see that are just plain dirty. If you are planning on photographing your gun clean it with alcohol and wax it. Nothing looks worse in photos than swirls, smears, and fingerprints in an oily finish. Wax solves that issue. Next is what I call "the illusion of virginity". No matter what you are selling the buyer wants to think he is buying something well cared for and barely used. To help this situation make your gun as original as possible. Just because you need a dot or scope to shoot well doesn't mean your prospective buyer does. And no matter how well the custom grips look, shine, fit your hand, or impress your buddies stock grips sell better. If the interested party looks at you and figures this old dude probably fired six rounds out of this gun and couldn't handle any more all the better. I'm not the guy that touches up blueing and lies about round count but I also don't want to give anybody a reason to think a gun has been rode hard and put away wet. Nobody wants an ex drag racing car, they want the little old lady's car.