Well, it looks like I may already have this matter licked. I had a Comp-Tac Infidel laying in a drawer and had almost completely forgotten about it since getting the Crossbreed SuperTuck. In case you don't know, the Infidel is all Kydex. Yes, I prefer leather but this works fine for my purposes.
So I decided to try an experiment. I took the XD 45 Compact (unloaded and cleared), tucked it in and tried a test draw. The holster came right out with it.
So I tightened the screws that hold the clip so it could grip the pants tighter, then slightly loosened the screws that control gun retention. Voila! Beltless IWB! The tension of the pants' waistline holds it all together solidly, and the extra tightness on the clip keeps the holster intact on the draw.
Next I tried it with the magazine loaded but nothing chambered. Same result.
Granted, this wouldn't be how I would walk around all day but it looks like a nice "slap on and go" option.
Either way, I'm happy.
:smile:
EDIT: And for those deeply concerned, no, I won't be trying this with the GP100!
:ahhhhh: