The Meprolight 0402243111 delivers unparalleled brightness for Glock 17/19 handguns, ensuring top performance in any lighting condition. Featuring a revolutionary self-illuminated tritium system, this sight guarantees exceptional visibility from bright sunlight to complete darkness. The vibrant colored front sight ring in green, yellow, or orange enhances target acquisition instantly An extremely bright contrasting colored front sight ring No batteries, no switches - always ready for action Fast target acquisition Tritium powered Highly durable structure Rapid instinctive aiming Choose Meprolight for unmatched clarity and precision every time.