Hi , Depends on your swing speed . I was surprised mine was only 75mph on my mid irons and i was fitted with 5.0 project x .

5.5 shafts are stiff and if the swing speed is not there you will hook the ball more often . Go get refitted with Ap2 irons and try the different flexes .

I love my AP2's , i hit them long and straight .

Good Luck 

Depends on your club head speed.

i hit the ball fairly long and I got the Project X 6.5's in mine.  They seem a little strong on some days when my swing is off.  But mostly, they are on spot and I have a high club head speed.  I do not remember what it is, but I do hit an easy 9-iron 150.

You should be fine.  Just get used to them.  It took a little time when I got mine, but I love them now.

Hope that helps.

Hey Kasheem,

  The Rifle 5.5 shafts are closer to a stiff then the 6.0's. I was also fit for my irons and my 6 iron clubhead speed was between 85-88.  The rep told me that i should go either Dynamic Gold S300 or the Project X 5.5. I chose the Rifles and I absolutely loved them!

I have the 5.5's in my irons (love them).  At TPI the fitter said that he thinks of 5.5 as closer to the R flex. He liked those shafts for me but also liked the S300Us. 

If you're young and strong, the 6.0s make sense to me. --Jerry

hi Geoff,

what's the clubhead speed for ProjectX 5? I am with the AP2 ProjectX 5, my 7 iron clubhead speed is 70mph, is that too stiff for me?

thanks