You are right, Kreighoff has been trying to copy what we have done for two years now. The raised rib concept was actually first done for Jon Kruger in 1994. Kreighoff may try and copy but as long as they continue to silver soldier the rib to the barrel they will never be able to repeat the POI gun after gun. Heat is a very bad thing when it comes to the construction of a good set of barrels.
Dennis- The rib on the pro-sporter is free floating, the construction of the rib and the barrel hanger system looks VERY similar to what you used to do on over/unders. Paxton has one in his new Krieghoff section if you want to check it out.