Features: Tritium front and rear with high contrast glow dot Photoluminescent glow dot absorbs ambient light and glows in low light Wide notch rear with serrations and anti-reflective lens Corrosion resistant Black Nitride surface finish Traditional 3-dot tritium notch and post sight picture Compatible with Glocks Gen 1-5 including MOS models Proudly manufactured in Fort Worth TX Fits Glock 20 21 29 30 30S 37 40 & 41