I had been playing 690mb irons for years and recently traded them in on a set of AP2's. Both sets of clubs have the same px 7.0 shafts and while I do like the AP2 irons, I find them a little bulky and having more offset than Im used to. I believe the AP2 irons may be a little stronger loft too because I do hit them a little longer but not much. I just believe the 690mb's were a little easier to work the ball both ways. I am a die hard Titleist iron player and have no intention of changing brands but do miss my mb irons. I had actually found a set of 712mb heads and had intended to build them to my specs but they were stolen out of my truck along with a new 713 d2 driver before I got to test them. Can anyone give me a fair comparison between the 690mb and the 712mb irons? I have also been playing Rifle shafts for years but had been considering the KBS C Tapers in the iron heads that were stolen. I play my irons standard loft and 2° flat so a stock spec comparison should be fine. Should I expect adding or loosing any distance if I swap from px to kbs shafts? Thanks to anyone who can help.