Wow, I can't believe it's been THIS long since I got my Sig 1911, but anyways:
When I got the gun, she sights were off. On top of that, the set screw for the rear sight was either damaged or some VERY unusual size. I bought many many different allen key sets and nothing worked. Finally, I took the gun back to the store and their gun smith adjusted the sights free of charge (good service!!) and the gun is now VERY accurate, as long as *I* am shooting it well. So, by now I'm very much enjoying it.