My guess is that it was probably built-in cast. I have built a couple of stocks with cast, but never tried to bend them afterward. On the other hand, I had several shotgun stocks bent by someone who has the same design jig as Mike Orlen. I have seen stocks moved from cast off to cast on. Sometimes it works, sometimes the stock loses the bend and returns to near original position. Also, you should know, the fit and finish of metal to wood inletting for both the top and bottom tangs will be changed if you move the stock very far.
