Sadly when it comes to production 1911's there aren't any options. Like others stated you either need to go into the 2011 world (STI) or the semi custom one. Wilson Nighthawk and Guncrafter offer all milling options from their shops. I have Nighthawk Shadowhawk Commander that came with a RMR cut and its been great. Thew new Nighthawk IOS system is also worth a look as well.