American sights are machined from us-made bar stock steels and assembled using swiss-made tritium light sources. Ameriglo specializes in iron sights for small arms, designing our own sights and working with OEM gun companies. Ameriglo sights are used worldwide by law enforcement, military, defense-minded free citizens, and recreational shooters. The clock classic 3-dot is a sight set with green tritium lamp, white outline front and two tritium lamp, white outline rear for Glocks. Visible under all lighting conditions..