The decision for the single tritium over two or three pieces was based upon our training methodology. We teach our students that the presentation of the weapon from the holster or the ready is a fundamental. It doesn't relate to the firing of the gun like most other marksmanship fundamentals but in order to achieve fast sight alignment the presentation must be as close to perfect every time.
Once students have moved on from entry level training and are really getting into shooting they typically are looking to replace the factory sights on the gun. The RB1 Combat Pistol Sights were not designed for entry level shooters but for the next level shooter.
The RB1 methodology for rapid sight acquisition and fast engagements is to present the weapon as fast as possible and have a 90% sight package solution at the completion of the presentation. This means that you should always see the front sight inside the rear notch at all times. We call this the CQB Sight Picture.
We perform the RB1 Compass Drill to confirm hits within an acceptable target zone with the CQB sight picture to highlight to students that you do not need to have a perfect sight picture in order to get hits on target.
This is the difference between bulls-eye shooting and combat shooting.
In combat shooting there is no score! An 8-ring hit is just as good as a bulls-eye when shooting 2 legged big game.
So, with this methodology in mind, when the lights are out or low, you need only present the weapon and you will have confidence that your front post will be inside your rear sight. If you have a flashlight either attached to the weapon or in the support hand you will see the silhouette of the rear sight and can improve the sight package as required. If you have ambient light you will be able to improve your sight package also. We see this to be less distracting to the eye under stress than two and three dot sights. Just need to present and place the one tritium dot onto the target. In low light or indoor shooting, the single tritium vial aids in seeing the front post quicker also.
Remember that you will need some for of light to positively identify the threat if present.
Hope that helps to enlighten you! Pardon the pun.