Fits Glock Models: 17MOS, 19MOS, 34MOS, 45MOS 17, 17L, 19, 22, 23, 24, 25, 26, 27, 28, 31, 32, 33, 34, 35, 37, 38, 39 and 45 The HD Night Sights were specifically created to address the needs of tactical shooters. The three dot green tritium night sight set's front sight features a taller blade and an aiming point ringed in photoluminescent paint while the rear sight is outlined in black and features a wider U-shaped notch. This unique configuration increases visibility and quickens front sight acquisition-even in transitional lighting. Additionally, the front surface of the rear sight is steeply hooked to assist in emergency one-handed slide operation. Green tritium lamps are warranted for 12 years from date of manufacture NOTE: Professional installation recommended. Dimensions for reference only. The HD MOS Fit sights are NOT intended to be used while also running a red dot, as they are not tall enough to be viewed through the red dot window.