Nice guns there, Jugglez... They yours?
As for wobble, I have none in my RIS or buttstock. My buttstock feels pretty solid, although the buffer tube has a little wobble, but I'm sure that's because the main bolt is loose. One thing I noticed on both my JG guns is that they needed pretty much any and every bolt tightened up out of the box. I suspect that's the case for the buffer tube as well.
One of these days when I'm not busy, I'll have to tighten that...