This is a XS Sights known as the RAM, model CK-R002P-6N.
XS RAM Night Sights feature a traditional 3-dot tritium" notch and post sight picture. The blacked-out rear increases contrast against the front sight. The front sight is available in orange or green and is equipped with Ember(R) Glow Dot Technology. Ember absorbs ambient light and glows in low light. The front tritium lamp charges the Ember dot making the front sight glow brighter than the rear at all times" keeping focus downrange. RAM sights are the brightest notch and post option for fast and accurate shooting in bright and low light.
Features:
10 Year Warranty - No Questions Asked night sight warranty
Tritium Powered Front & Rear Sight -Glows in low light to aid in sight alignment
Fits standard holster options
Quality Manufacturing