If you've got money to burn, then replace the barrel.
My AR started its life as a 16" Bull Barrel (.930 dia). While it was not light, it was WAY lighter than the RRA Predator .308
I had, that thing was HEAAAAVY!
SSRNZ turned the barrel down to a medium profile (.75 dia) from chamber to muzzle, and fluted it before and after the gas block. Now its lighter, handles better, looks better and will put 5 rounds of Hornady training ammo into a group the size of a 10 cent piece at 100m time after time.
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