Glock Night Sight 4.1 Front, Screw-On GMS (G17 Gen5, G19 Gen5, G26 Gen5, G34 Gen5 MOS). Manufactured from steel, this front screw-on GMS 4.1 night sight is for the Glock Gen5 G17, G19, G26, and G34 MOS pistol platforms chambered in 9mm. This night sight is perfect for providing the operator quick and easy target acquisition in a range of environments including low-light to night settings. Add this piece to your current platform pistol build or keep as a spare for the next workshop project. Brand: Glock Caliber: 9mm Finish/Color: Black Firearm Type: Pistol Material: Steel Compatibility: Glock G17,Glock G19,Glock G26,Glock G34 Sight Style: Night Sight