Finally got this - DeSantis The Hidden Truth IWB Kydex Holster

This fits my P320 perfectly, even with my TechniClip on it! As with the better kydex products, there is a tension adjustment, so you can make it as tight of a draw as you feel comfortable with. Surprisingly, the mag holder feels large and I can't make it snug enough to feel totally comfortable with it yet, but I'll keep playing. In other words, I could do a cartwheel and my weapon would stay in its place, but I'm pretty sure the mag would just drop out (imagine a verrry slow cartwheel...lol)