As a sales person I can assure you that it is much better to handle questions in advance rather than deal with possible objections.
"Google is not your friend" as a salesperson. You are leaving your sale dependent on the opinions and reviews of complete strangers, strangers that may very well have absolutely no idea what they are talking about. Internet reviewers are looking for clicks not accuracy. For example, I watched a video on line last night that looked very professionally done regarding Toyota's new line up of trucks. In the middle of the video it described Toyotas existing full sized offering as the "Titan" complete with pictures of a Nissan.
Also on their internet travels they are going to find prices of every similar model that has sold. Sale prices from years ago and discontinued close out prices will make you look like a price gouger in today's market.
The biggest fear of a potential buyer is the dreaded "buyer's remorse". Hesitancy turns to negative thinking and no sale. Many have been stung before. They don't want to be stuck trying to move something they should have never purchased in the first place. This is why including "why you are selling it" is so important. Obviously you no longer want it or it wouldn't be for sale. Who among us wants what someone else doesn't want? You are selling the product for a reason. Do not leave that reasoning up to the imagination of a potential buyer.
Most of the obvious has been covered but for me the weight of a gun, drop and cast are deciding factors. I have more than enough shotguns (actually need to move some) however I am always tempted when I see a nice gun that I know is going to fit me, especially a light field gun.