Best lightweight ar10???

[I make oil]

Vortex are awesome scopes. I have a set of their binoculars and they are every bit as good as my buddy's Stieners. Good luck picking a rifle. Half the fun is the shopping.

Why so set on a AR-10? Have you thought of a 300 blackout/whisper in a AR platform? That is an awesome round with ton's of versatility. I have a Contender barrel in 300 Whisper and shoot 220 gr bullets loaded down to subsonic velocity. It's as quiet as a .22 rimfire. Loaded that way its so easy to suppress and if you want to shoot smaller 120 gr bullets you can load it to near .308 velocities. In a AR you can make it into a super light weight package.