For my uses a quality lightweight barrel all day long.
I had mine out last night shooting paper at 100 yards, with the 2.4 lb Criterion lightweight 18.5" barrel and it shot easy sub-MOA with some of the loads. Hirtenberger surplus was shooting 1.5 MOA in 5 round groups, it's the most accurate semi-auto rifle I've ever had shooting Hirt. Got the barrel warm with some pistol mag dumps and no appreciable change in accuracy. Gun is 7 lbs 3 oz naked, 8 lbs 4 oz with the 1.5-8X Vortex Razor HD Light Hunter and Aeroprecision mount.