Here is a link to mag test I did.
http://www.ar15.com/forums/topic.html?b=8&f=48&t=446709&page=1#i4779958

I've never had problems with the Gen. II mags. As fine as any.

I've not had any problems with my Gen I, other then it not dropping free. This mag seems to be indestructible under normal use, I think even the tire test was beyond "normal use", but it passed with flying colors. I have more test planned for this mag. I don't want to destroy it, I just want to know and tell everyone here what it can do. Stay tuned, more to come.