A wise old man told me to never sell a gun. You will regret it. I listened.
My best friend always said that. He passed away a few months ago, and I recently went through his gun collection with his wife, helping her to decide which guns to give to the son-in-laws and grandsons. I want to be able to enjoy my guns while I'm able to do so, so if I want to sell one that I don't use and buy one to play around with, then I see nothing wrong with it. I have a few family heirlooms that I'd never part with, and want them to be passed on down thru the family. Otherwise, most of the rest of my collection are expendable.