Jason, what I remember of Athoul's G1's is that they had a metal tube, I think FlyingLocust switched to plastic to push costs down further.
As far as I am aware there are no different designs of the G2's, they are all identical. Perhaps they have removed the packers on the G2's.
Hopefully at Capital Bocking people will have G1's and G2's so I can look over them thoroughly and compare differences, rather than going of information from manufacturers and resellers.