fyi thats a real life scar, not airsoft

that explains the gold color I think + the fact that the quality of the pics are top notch.
Also, it seems that this particular sniper variant of the scar is just out....maybe that is why you can't find it right away, let alone for airsoft.
But I will look out for it, maybe some day they will sell this kind of stock seperate

But I bet it would cost as much as a WE Scar rifle