No, it did not. The rear is a Bo-mar that I had lying around and the front is a fiber optic - can't remember the brand. Additionally, the trigger, sear, disconnector, hammer, mainspring housing, mag release button and mag well have all been changed.
They do come with adequate sights, triggers and internals. I was actually surprised at how nice it was. However, I have my preferences for the guns I carry or compete with. Since I do both with this one, I set it up that way.
No, they don't fit in the factory dovetail. There may be some sights that do, I just have never found any that I like as much as the BMCS. For the money, the PT1911 can't be beat. Especially if you like it the way it is, however it is also an excellent base for building on as well.