This one of the barrels they had in stock. The mount screw spacing is not the issue, as it's set up for the super 16 forend. The G2 carbine forend should match this.
I was trying to get a barrel diameter for a stock T/C G2 barrel to see how much I would have to hog out the barrel channel to fit the MGM. As it's .810, it should be real close, and will probably only require minor work to get it floated.
Again... Thanks for all the info.
Bill