Whats the difference between mitsubishi ck amc iron shaft and the mitsubishi av series am(2) that is the standard for the new T300 iron. I ordered the T300 with the ck amc shaft not realizing Titleist uses the Av series am (2) in the T300. I have the ck amc in my 718 ap1's so naturally thought that was the shaft used in the T300.