You might consider a Springfield Armory M1A Squad Scout or their SOCOM 16.
They are lighter than advertised. Mine, a Squad Scout with a synthetic stock w/o the steel trap butt plate runs 7.8 lbs. w/o the scope. With a Leupold 1.5-4X Scout Scope, it runs 8 3/4's lbs.
The triggers are far better than any AR I've ever tried. After a trigger job, their second stage break is very close to my bolt guns.
On top of all that, they come with a muzzle break that allows you to stay on target nicely for follow up shots.
Mine shoots 4 rds. into 1.5 MOA consistantly with about 5 different hunting loads.
Their reliability is considered better than any of the AR .308's. E
