Nothing has been changed except the flat grind is true and flat. The flat grind on the RAT-7 and others was not consistent in the past and the extra weight was due to extra steel in the taper, while others would have a real thin taper and weight less. In fact, that's one of the things that Ontario is suppose to be changing with their new production procedures. With the RC-6 we didn't set out to make it lighter or have a weight savings, but it came out with a good weight once it got ground to specs.