Viking-
If its what I think your referring to, HPG sells them. Got one with my HPG I use for my Glock 20 for the reason you mention because I had the same thought.
As it turns out, not sure its necessary as there is very little for the trigger to snag on in its slot of the kit bag. Still nice to have and I prefer to use it. Its cord attaches to a loop in the bottom of the slot and the guard detaches from the pistol as it clears the top.
The kit bag also has room to carry my "never go anywhere without it" stuff as well. Compass, extra knife, fire starter, lighter, snacks, mini flashlight, etc as well as an extra mag, speed strip, or speed loader depending on what I'm carrying. Good unit.
Joe
