Not too sure on this as I do not remember every having a problems and I have the same set-up. Will have to check my barrels but fairly sure you should be okay. I am to understand that you are talking about the G2's and not the Contender and a round barrel. Right?Carbine barrels use a different spacing
Not to mention that the anchors can come loose under severe recoil. One of mine did. Had to put it back in and beat hell out of the barrel with brass to resecure it. So far, it's held.It's easier and cheaper to just drill and tap for the screw and bypass the dovetail completely.