The part that I worry about is that it looks like you can shoulder it and get a cheek weld from that thing...
Somebody needs to buy one(and I know just the person),then shoulder(w/ cheek weld) the weapon with the "normal" hand on grip,finger on trigger,and let us know just how comfy it is.
The person should also be a "non-midget". --- SAWMAN
Looks like the sample they sent to the ATF was made out of foam rubber...
http://www.sigsauer.com/upFiles/ATF-Approval-Letter.pdf
May be better than this stock.
http://www.thefirearmblog.com/blog/2012/09/03/a-chin-stock-for-ar-15-no-shoulder-needed/
Ian, come by sometime and check it out. There's one on a SIG 556 pistol. It doesn't feel too bad on the shoulder but I have yet to actually shoot one.