I have this upper and have shot less than 10 rounds through it. I was wondering if any of you have traded in any uppers recently and could direct me to a shop that gives a reasonable offer on lighltly used firearms? The market seems to be saturated with manufacturers and I have considered selling it locally, but have not made the time to do so. In my experience most of the local shops around and in the southern Maryland and king George va area do not offer much for a lightly used upper. And help/guidance is greatly appreciated.