I agree with hobgob. Go with the Millspec, not the GI. The Millspec has a much better set of sights, the ejection port is lowered and the back of the port is scalloped out so your brass doesn't get dinged so bad. In the last batch of 6 that I examined, 4 of the 6 were some had some of the best fitting of slide to frame I have EVER seen on a 1911 factory gun. This includes hundreds of Kimbers, Colts, Wilsons. They rivaled my custom Bullseye wad guns.
FWIW
Stork