Night Fision Optics Ready Stealth Springfield Armory Night Sight Set Springfield Hellcat OSP/XD-S w/ 507k Black Front Ring. Like all night sights Night Fision uses self-illuminating Tritium to get the ''always on'' glow that makes them so effective. Night Fision sights have 30percent more Tritium than most sights on the market. The Tritium insert isn't surrounded by a painted-on ring but rather one made of a daylight fluorescing material that produces optimum visibility in daylight. Night Fision's Optics Ready Stealth Series (ORS) sights are engineered to offer a lower 1/3 co-witness with your slide mounted red dot sight. As an alternative to repurposing Suppressor Height sights ORS sights are designed from the dovetail up to work as back up sights for red dots obscuring less of the optic window while still allowing three dot sight alignment if needed. Specifications for Night Fision Optics Ready Stealth Springfield Armory Night Sight Set: Manufacturer: Night Fision Gun Make: Springfield Armory Gun Model: Springfield Armory XD-S Mod2 OSP Springfield Armory Hellcat RDP Springfield Armory Hellcat OSP Color: Black Sight Style: OEM Height Fabric/Material: High Quality 4140 Steel Gun Type: Pistol Front Blade Height: 0.248 in Rear Blade Height: 0.268 in Illumination Type: Tritium Illumination Color: Green Features of Night Fision Optics Ready Stealth Springfield Armory Night Sight Set Brightest Tritium Night Sights on the market Domed lens collimates tritium rays for a sharper sight picture CNC Machined out of high quality steel Black Nitride coating used to improve wear and corrosion resistance Installation: Gunsmith Recommended for Installation Information please review Night Fision Install Guide Package Contents: Night Fision Optics Ready Stealth Springfield Armory Night Sight Set Night Fision SPR-229-248-268-ZGZG: Optics Ready Stealth Springfield Armory Night Sight Set Springfield Hellcat OSP/XD-S w/ 507k Black Front Ring