Pretty much every gun I own is a recent model that was bought new, and then had some slight modifications done (with a couple exceptions that are still stock). Things like adding night sights to a pistol or adding a rail to the receiver of a shotgun. All of these are of the "modern construction" variety, i.e. polymer frame, lightweight, and all are barely used. I've never dealt with buying or selling used guns, but I'm looking at selling some of mine off in the nearish future for a few different reasons.
So I'm here wondering how pricing works when selling used guns. If I took a $500 NIB pistol and added night sights, for example, and I've used the pistol on sparse range trips over the course of a year or so, what would be the value of it now? If I've had a shotgun for a few years that I've added a rail to and upgraded the stock, how does the fact that it is used and the fact that it has had some modifications affect the price?
I'm not asking about my specific models, I'm more asking for a general rule of thumb on how those two factors - how "used" it is and any modifications - would affect the price.
So I'm here wondering how pricing works when selling used guns. If I took a $500 NIB pistol and added night sights, for example, and I've used the pistol on sparse range trips over the course of a year or so, what would be the value of it now? If I've had a shotgun for a few years that I've added a rail to and upgraded the stock, how does the fact that it is used and the fact that it has had some modifications affect the price?
I'm not asking about my specific models, I'm more asking for a general rule of thumb on how those two factors - how "used" it is and any modifications - would affect the price.