+1 to Shadeangel's perspective, just too much junk IWB. I only select IWB magazine if I'm carrying the HG somewhere else, which generally isn't very functional.
Here is a novel design
www.desantisholster.com/n91.html , the're probably others too, (tried it at the store, good concept, below average execution) with a magazine slot forward of the HG slot; I'm going to be asking Mark at Crossbreed if it is practical to develop for this a version of his excellent tuckable Super Tuck holster, .
www.crossbreedholsters.com/beltslide.html.