Is there anyway to put a holster inside of the HPG rig? Nothing fancy, just to cover the trigger and keep the pistol from floating around. Kind of like how the Koala has velcro for a holster.
A pistol won't really float around much, however if you're concerned, I'd suggest an Uncle Mikes IWB holster------the cheap ones with the pocket clip that completely collapse w/o a pistol. You could probably safety pin the holster inside the KB so it doesn't follow the pistol during the draw.
