Home Forums Hunting & Shooting Handguns Why no "U" type rear sights in Tritium?

So I bought some Trijicon HD XR sights for my G40 and at time of installation, decided that for now I would prefer an adjustable rear sight on my field pistol so I kept the factory ones.
Upon further consideration I wondered why nobody has made an adjustable rear sight in the "U" style that Glock provides as factory... I kind of like the idea of the "U" but with at least some visibility in the dark for something something reasons. I can understand the angle of "low emission", "practical distance in the dark just use the front post", "manufacturability" etc but does anyone else have some better explanation? It doesn't seem like it would be difficult to accomplish so why doesn't it exist? Sales potential?

I use Ameriglo Agent sites on my Glocks.......Tru Glo has their Tritium Pro U sights as well......

The Novak Tritium sights on my 1911 went out long ago and I’ve even considered dabbing some white paint into them. Shooting that .45 at an indoor range along with my 9mm with the Dawson fiber optics, what a difference in how much better I can see those fiber optics. A white outline blade for my S&W J-frame would help a whole bunch too.

Harrison Design makes a rear sight I like better than the Novak I have on my both my Glock and Springfield TRP. It looks like a Hiene ledge on steroids

There is one school of thought holding that the rear sight serves only as a window through which to view and focus on the front sight with the target slightly out of focus in the background. In keeping with that, there should be no distractions on the rear sight, only a sharp, deep notch:



After enough presentation repetitions, muscle memory will provide for sufficient alignment so that, in haste or in poor light, the shooter need only index the front sight dot with the target.