My google-fu is weak and I had trouble looking up the weight for 20" Hbar barrels. Not taking mine apart just to weight the barrel... My 16" bull barrels clock in at about 3lbs on the money (barrel and extension only).
My 20" Colt Hbar is a 1/9" twist. My 6721 (the Colt 16" 'carbine length' Hbar) - is a 1/9" twist. Majority of my 16" bull barrels are 1/9" twist...The Del-Ton barreled upper is a 1/9 twist which is fine for me; I typically only shoot out to 100 yards, and most of my ammo is 55 - 62 gr stuff which is perfect for 1/9. It isn't chrome lined, but I'm fine with that too; chrome lining doesn't really matter with my volume of shooting and the chrome-moly steel is accurate.
You nailed it as well about the chrome lining and how it relates to accuracy.
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