You don't need that Bs with there's. There holster are . Built with a convex curve to get them as tight to the body as it can be .
They are also building a New Appendix rig with TnSteyr, that will have a mag pouch too .
Send them a email and talk with them .
There pic of them on TnSteyr INSTAGRAM, FACEBOOK YOUTUBE showing them too just for Steyrs
If you want something with a little more leather ProTEQ can make one, customized to your attachments as well. You may need to send your stuff to them, or a Bluegun, but they do amazing work and lifetime guarantee on the product. Pricey, but you definitely get what you pay for. I have their Full Size, Micro, and Cup/AIWB; all are super-comfortable to wear for hours.