Selling your Ion would be a waste of time. Since so many people have them, and so many people are trying to sell them, the resale value sucks. Supply and demand. Supply is high, and demand is low. So dont sell it. The pmr has a great board and internals. The things you need to upgrade are the feedneck, back cap, barrel, trigger, and maybe a new trigger guard. It's a really good gun and the resale value isn't bad either