Glock Night Sight 6.5mm Rear, GMS (G17 Gen5, G19 Gen5, G26 Gen5, G34 Gen5 MOS) Marked 6.5. Manufactured from steel, this 6.5mm rear night sight is manufactured for Glock G17 Gen5, G19 Gen5, G26 Gen5, G34 Gen5 MOS pistol platforms chambered in 9mm. This sight is perfect for providing the operator a quick sight picture in low light environments and works great as an immediate upgrade to your slides current sight or as a new addition to your Gen5 Glock pistol. Brand: Glock Caliber: 9mm Finish/Color: Black Firearm Type: Pistol Material: Steel Models Fit: Glock G17,Glock G19,Glock G26,Glock G34 Sight Style: Night Sight