It seems a very common occurence, judging from posts in this forum, and backed up by my own experience, to send a weapon in for repair to SA and have it come back with the zero altered, sometimes radically, and almost always in elevation. Mine came back shooting nearly a foot low, after being dead on out of the box. What's with that? I've recently read posts listing changes from 3-10 inches low. Come to think of it, it almost always shifts down, too. I think we should bring this to SA's attention, it seems too common and uniform to be casual coincidence.