This ABS Carbon Fiber wrapped Rock Creek 5R .308 barrel blank has a 1:11.27" twist and will finish at 24". It has the Sendero contour. $830 shipped fully insured to the lower 48.
I just weighed it on a digital postal scale I have, and it read 3lbs .05 ounces. So, just a hair over 3 pounds. Not 3.5lbs, but 3lbs and 1/2 of an ounce. Hopefully this helps.