The HD XR Night Sights for H&K handguns from Trijicon maximize sight visibility in any light condition. The tritium-filled glass lamps provide unparalleled illumination in low, or even no light settings. Each lamp is capped with a sapphire jewel to distribute the light evenly, and protect the lamp from damage or chemicals. XH HR Night Sights have a silicone rubber cushion to provide additional protection to the lamps. U-notch rear sight design Protective aluminum cylinders for the tritium lamps Enhanced front sight acquisition Excluding VP9 Optics Ready These XD HR Night Sights are compatible with H&K handguns, Excluding VP9 Optics Ready. Mfg: Trijicon