From my review of the original production-run:
http://www.bladeforums.com/forums/s...s-(warning-pic-heavy)?p=11703577#post11703577
That's with canvas micarta, G10 would weigh a little more.
Another reviewer posted their second-run GSO-10 as 19.5 oz with G10 scales, would be a little lighter with micarta, so the second run took off a bit of weight.
The newest batch hasn't been made, but Guy increased the thickness from 0.1875 to 0.20" so expect it to be a little heavier...