I just called and talked to a woman at http://www.mmcsight.com/index.htm. She said that the sights they have for the PT1911 are the exact same ones they sell for the Millenium Pro (PT145) and that they're off by thousandths of an inch. They require minor filing/fitting (minimal effort) but they end up being zeroed at 25 yards.
I'm probably going to order a set within a couple days. =)