Used prices are always subject to debate. I've ways been willing to buy or sell a rifle that is truly as new, in the box with all docs, for 85% of the best new price. I think that recognizes some depreciation, and offers some incentive to take the risk of a used rifle. But again, that is for a legitimate as-new rifle. From there, it can be anything. And I you have done any modifications, expect a discount. Even those of us who like to tinker, don't want to buy someone else's tinkering. Some folks know what they're doing, some are incompetent, and some are dishonest. If you tinker, keep meticulous documentation of exactly what was done. Show that you know what you're doing.