Made the adapter to fit a german police slim grip on the gsg5p and wanted to show it off. With a little tweaking the adapter can be used with the mp5k vertical foregrip once my form 1 clears.
I like it. I haven't shot it much as I am in the process of SBRing it. It is a little heavy but a choate folding stock should fix that problem (or at least stabilize it a little.)