3 tritium dots seem to be waning in popularity. Wilson Combat recently introduced a wide notch rear with no tritium, and it's very popular. Other high end 1911 makers are using gold bead front sights, again, no tritium or marks on the rear sight.
I read an article where a study with the NYPD showed that most officers didn't even use their sights during a gunfight; point and shoot seems to be pretty common. I am doubtful many 3 dot lineups have happened in self defense scenerios. I also remember reading a well-known handgun instructor half-jokingly said if you really want to prepare for self-defense shooting, use squirt guns and shoot from the hip. Having a big front dot to put on your target is quick, easy and probably more practical.
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