Yeah I was just looking, seams all the 1-6X also have lighted reticles that add weight.Closest I know if is the Leupold 1.5-5x or 1.75-6x. Their 30mm's aren't too bad on weight though. Burris had a 1.5-6x.
My 308 AR has a tank of an optic Crimson Trace 1-8X 34mm tube it's great but it's heavy. I'd love to have something lighter but hate to give up magnification.