Throw up some pics.i would like to see that.Bitten,
It is quite easy to build a large frame AR10 under 6 pounds, with a scope that would be about what a stock AR15 weighs empty. And that's using the full size receivers, there are many now who copied Harrison's small frame 308 build making stock 308's about 7.1 pounds.
Heck my latest AR 6.5 Creedmoor has a 20 inch barrel at 35 ounces. With the same barrel profile it would be slightly lighter with a 6.8 bore. Entire rifle weighs 4.9 pounds, under 6.3 pounds with scope and mount.