Night Fision Costa Ludus Night Sight Set For Glock 17/19/34 Black . There are serrations on the front and rear sights to reduce glare and serrations on the front rear edge of the rear sight to maximize one-handed manipulations. Costa Ludus sights include a proprietary Night Fision Perfect Dot in the front sight and a horizontal tritium bar in the rear sight. The rear sight is also cut to maximize the target picture for fast acquisition. . Specifications for Night Fision GLK11YGXG Costa Ludus Night Sight Set Glock 1717L1922-2831-: Manufacturer: Night Fision Gun Make: Glock Gun Model: Glock 27 Glock 25 Glock 35 Glock 38 Glock 17L Glock 39 Glock 17 Glock 34 Glock 24 Glock 37 Glock 28 Glock 32 Glock 26 Glock 31 Glock 23 Glock 19 Glock 22 Glock 33 Color: Black Front Sight Color: White Rear Sight Color: Yellow Fabric/Material: Aluminum Gun Type: Pistol Illumination Type: Fiber Optics/Tritium Illumination Color: Green Condition: New Night Fision GLK11YGXG Costa Ludus Night Sight Set Glock 1717L1922-2831-