DakaDex, that my friend is the stock from the H&K SL8. Google can supply a good picture. It is the offspring of the G36 and the MSG9. Cheek riser and cutout pistol grip.
I wish I had money to modify my G36k. I think the multi-position, side folding stock for the G36 family is the best aftermarket stock for the G36. Everything else looks like someone is trying to make either a M4 or an AK out of their G36. Each gun has it's own aesthetics, accentuate them.
Heed wisdom regardless of where it comes from.
"The circumstances of one's birth are irrelevant, it is what we do with the gift of life that determines who we are." (Mewtwo, Pokemon The First Movie)