Check out the Trijicon HD night sights. I have them on my Glock 19. Large night sights with large orange ring around front tritium vile. My FNS 9 came with Trijicon night sights that had the white ring around the front tritium vile. Good sights, but I painted the front blade with Testors Florescent Orange Paint. Now I have the night sights plus a large bright orange front sight for quick daytime acquisition.