The Glock Enhanced Combat Sight™ was developed soon after the release of the 1911 ECS™ sight back in July of 2012. I officially released them to the public in May of 2017 and announced Combat Precision to the Glock™ world.
These are sold as a set, as well as the rear only to allow the end user the ability to custom tailor their front sight height to accommodate various effects to point of aim/point of impact. Grip technique, trigger press, gun modifications, ammo, and of course the shooter themselves all determine the perceived POA/POI.