Well if you go by this table
Green Mountain Heavy, 20" :____~ 3 pounds
Green Mountain Fluted, 20" :____~ 2 pounds 8oz.
Green Mountain Heavy, 18" :____~ 2 pounds 6 oz.
Green Mountain Heavy, 16 ½" :__~ 2 pounds 4 oz.
"WMBS" 22" Sporter*:__________~ 2 pounds 3 oz.
[also the "Wal*Mart" 'Special' 22" barrel]
"Ruger" Factory Sporter, 18 ½" :___1 pound 14 oz.
"Clark" Sporter__________________1 pound 14 oz.
"GM" & "WMBS" weights are from Ken Clark at "WMBS".
That would mean that the barrel you mention is 2 ounces lighter than factory carbine barrels. I had a fellow tell me his 16.5" fluted bull weighed in at 32ounces (2 pounds) on a postal scale. so that should give folks an idea of what kind of weight they are looking at.
Once again, the guys with WPs say they work pretty good, I just prefer a solid chunk of barrel rather than multiple pieces.
Dave Z.