the theories on why they have cracked forget one thing, Shadows made at the same time, aren't cracking. Same metal, same machining, although done on different machines, and same basic design and specs. The 2 has had all dimensions trued better than the 75 did, resulting in a tighter gun, but that shouldn't account for the cracks. I've looked at my 6 Shadow which have almost a million rounds through them, none are cracked. My practice gun is at 75,000+ rounds, no crack, and it's consecutively serial numbered to my match gun which did crack. There has to be a specific reason for this that we haven't figured out. Also, CZ clones have experienced this as well, enough that some have solved the problem the same way, cutting the offending ara out.