No, that's an mp5 endcap, I'm looking for an mp5k endcap. It looks similar to that but it's more a flat plate rather then an end piece. This is it here.
The one in that picture even has the same three holes that have been drilled in mine, since I got the pic from a mod walkthru on how to mount a side-folding pdw stock on the mp5k.
Kuro_Neko