You know, jsbethel, you have a lot of good ideas. I was way too quick to dismiss the 39 series mag idea. I expect before I'm done I will buy one of those, then a Pachmayr mag sleeve, then a Kahr MagGuts kit. If that all works together, I'll have a 10 round CS9 mag! (Of course, it will make the grip kind of long, so maybe only for a mag change, not for primary carry.) Then I will have to buy a few more, and also experiment with the MagGuts kit in the CS9 mag body for a +1 in the original dimensions. If that works, I will need a few more. You get the idea. My CS9 came with three mags in excellent, maybe unfired condition, and I also had four brand new ones still in factory packaging I bought even before I bought the CS9 so I would be prepared. It never ends...

But thanks for the great suggestions,jsbethel!