Billy-T has one, listed as Auto Handgun. It's only a single, but if you retexture it from the slick black leather to something more textured, it works pretty well. I think Questor was working on one, but I don't think it got finished. He has a lot of gunbelts, but no shoulder rigs. There's a web gear piece in PhilC's BDU set, but no shoulder holster.