The Trijicon Bright and Tough ST01 night sight set brings the proven tritium performance that law enforcement agencies and serious defensive shooters have standardized on to the Steyr Mannlicher M and A1 platform - giving Steyr pistol owners the same self-luminous three-dot night sight capability that makes Trijicon the benchmark for defensive pistol sights across every major platform. The Tritium Night Sights ST01 three-dot system provides self-luminous illumination in complete darkness and low-light conditions without any batteries, electronics, or activation required. The tritium-phosphor lamps glow continuously through passive tritium decay - keeping a clear, fast three-dot sight picture available in the low-light defensive situations where standard factory sights become difficult or impossible to align quickly. The ability to acquire a proper sight picture in darkness at the same speed as instinctive shooting is what makes tritium night sights a meaningful upgrade for any defensive pistol over conventional sights that disappear in the dark. The Trijicon Bright and Tough ST01 shock-resistant design handles the heavy recoil and hard use that a duty and defensive pistol accumulates through regular carry and training. The metal body housing provides structural integrity around the tritium lamp assembly. Silicone rubber cushioning absorbs the shock forces that reach the sight body through recoil - protecting the tritium glass lamps from the vibration and impact that would damage less robust sight designs over time. Each lamp in the pistol sight ST01 is contained within an aluminum cylinder for additional protection and capped with a sapphire jewel that evenly distributes the tritium light output while protecting the lamp from cleaning solvents and puncture damage. White rings around each dot maintain daylight visibility across all lighting conditions. Trijicon Steyr-Mannlicher M-A1 3 Dot Set ST01 600491 in Front White Outline/green Tritium