This is just an FYI for those who have not run into this problem with the new G2 frame as of yet. Thompson claims that the new G2 will accept all contender barrels. Unfortunately, this does not include the older SUPER 14 barrels. I have a 35rem barrel that would not lock into the new frame. After several calls to Thompson, I was told that "all contender barrels fit" was not the case. I had it modified free of chanrge after a lengthy conversation with their support staff. However they initially wanted to charge $60 for the modification. This is in no way meant to be a shot at Thompson Center. They manufacture top rate firearms. It is only a warning for those of you who have purchased the new G2 frame.