J.:
If it's an adjustable OWB you want, you might get in touch with Kevin at K&D Holsters:
http://www.kdholsters.com/pd.php
Although I carry my R9 exclusively in the pocket, here's a photo of an "Adjustable Paddle Defender" rig that Kevin made for my HK P7:
(http://i2.photobucket.com/albums/y30/RichardS/hkp7withmicartagripsandkdpaddledefe.jpg)
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(Contrary to what is shown in the photograph, I should note that I no longer use 147-grain ammunition in the P7, since its gas-retarded recoil system was designed around the 115/124-grain NATO round.)