The Trijicon HD Night Sight Set for Glock Slimline MOS is an elite tactical upgrade specifically tailored for Glock slim-frame pistol configurations including the G42, G43, G43X, G43X MOS, G48, and G48 MOS. Forged from phosphated steel to endure harsh field duty, this self-luminous iron sight pairing uses green tritium phosphor-filled lamps encased within aluminum cylinders to guarantee visibility in zero-light scenarios. The front sight houses an aggressive photoluminescent yellow paint circle that naturally steers focus toward the central glass lamp. The rear face features a wide, un-outlined "U" notch coupled with a deeply hooked forward surface designed specifically to aid in single-handed slide cycling against a belt or hard edge. Note: These particular HD MOS Fit iron sights are tailored for slimline slide geometry and are not intended for co-witnessing through a pistol red dot window. Trijicon HD Night Sight Set MOS w/ Green Tritium U-Notch Rear & Yellow/Green Tritium Front for Glock 42,43,43x,43X MOS, 48, 48 MOS GL143-C-601163