Millett is well-known for their sights, but these are not the only M-1911 parts they produce. They are currently into the magazines and grips business, as shown below.

Millett is offering a wide variety of sights for the M-1911. Some of the models are shown here.

These ones are their tritium sights, in a bar-dot-bar configuration.

Finally, you may check Millett's red dot sights, which can be found in the "Opticals" menu.