Our R3D tritium sights were our first 3-dot notch and post product. The front sight features a green photoluminescent glow dot surrounding a tritium vial in the center. The combination gives you a vibrant front sight in bright light and a glowing sight in low light. The rear sight features two tritium vials for low-light indexing and has a simple, blacked-out face to contrast with the front sight. The rear sight features a wide notch, allowing for fast sight alignment and easy indexing with the front sight in any lighting condition. Fits Springfield Hellcat/XD; FN Standard Height/509; Sig P320/P365/P226.