I've noticed this post is really lonesome with no replies. I had a similar "wish" for a heavy barrel for by sporter barreled 16FCSS in .223 Remington. I called Savage (I suggest you do, too) and learned they have the heavy barrel and the Accustock to fit it but because of the pricing and somewhat to Savage's policy of requiring barrel change by the factory, I might as well buy a new rifle configured as I want. I infer that the stocks are different for heavy vs sporter barrels.
I May do that.
On the other hand, the 16 FCSS is shooting groups of less than 1/2 inch at 100 yards with factory ammunition (Black Hills 69 grain Sierra Match King Hollow Point Boat Tail). So I don't mind waiting for the barrel to cool. A local competitor shooting .223 using the AR15 platform says the best shooters he's competing with, "shoot really hot" barrels. YMMV
It is important to torque the action to the stock as instructed in the manual. I watched groups shrink by increasing torque and firing four rounds. At about 30 lb/in group was minute of angle at 100 yards. At 40 lb/in, groups were at or below 1/2 inch at the same distance with the same ammo.
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