I think the old barrels will fit the G2 but I don't think the G2 barrels will fit the original contenders. What engraving does your contender have? Is it a deep wide engraving or a shallow light engraving? My father has an older one with the deeper engraving and mine is newer with shallow engraving. The G2 looks like a smaller encore with no engraving. If you have a picture it would help.