Wasn't there some new regulation that came into effect a while back which prohibited all launchers and accessories? I can't find the post about it anymore, but as I remember it, even sights for M203s were prohibited now.
I suspect these grips face the same challenges (the real ones anyway).
The Pro-Arms version looks interesting, if it isn't outlandishly priced. They really need to make a version without the stupid flashlight mount, though (or make it removable)
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