There may well be a lot of opinions on this, and there is certainly the fact that they should not have these kind of issues . There is nothing in the operators manuel to tell you how to avoid them. I in my case having the proper equipment and having had quite a bit of experance with such things I got out the book which says that size screws in such circumstances should be torqued to 28inch pounds so every time I have taken it apart I have done so when I put it back together. Having shot it for two years with out a problem I belive if it cracks now it will be either poor material or a defect in the material. How ever I also believe that to loose or to tight can cause this problem if its to loose the barrel assm. can slam back every time you shoot it and because of the way they are constructed I believe you can crack the by screwing down the stock so tight that it will eventually crack.
Just my opinion. Lee