TRUGLO BRITE-SITE TFX PRO FOR GLK 42

They created the original TFO(R) day / night sight, then made it virtually indestructible with their hermetically-sealed TFX(TM) sights. Now, they are taking TFX(TM) technology to the next level for professionals and shooters who demand maximum performance from their handguns-providing ultimate reliability, accuracy, and brightness no matter how tough things get.