That sounds like a very thorough test program, wow!
Do you recommend we do the screw mod for extra stability as per bfiles and some members above ? Seeing pictures of the stock removed and ?2mm of wood in front of the top stock
bolt has me concerned. That thin wood is what looks to have broken for that one member who posted pics. Let us know what you think TI, thanks !
I know you're looking for TI's response on this, but I'll chime in.
Having done the mod I can see how the two pins can be put under some stress; with the weight of the rifle hanging off the grip, the top pin is being pulled against that 2mm of wood, while the bottom pin is working in compression. I don't really see the bottom pin being a weak point, and that's why we've seen the stock break at the top pin.
By placing a fastener at the top portion of the stock, through the back of the receiver, I think a lot of strain is being taken off the higher stock pin.
My two cents.
It will be interesting to see how many more stock rifles fail, vs. how many modified rifles will fail.