I have a Colt R6500 Sporter II in very good condition. I don't have the box or anything else, just the rifle. It's completely slick-sided. I don't know how to post pics, but I can email all the digital pics you want. I know you're looking for at least LNIB, but if you're interested in a slightly used model, I could pony up some bucks for the difference. I've been looking for an accurate AR-10.
email me at email@example.com if you want to explore this further.