APX Night Sights Kit feature tritium gas-filled lamps with a sapphire front lens which focuses light and is impervious to solvents. The sapphire lens-enhanced tritium vial, is one of the brightest in the industry. These sights have a precision machined metal body that hold the tritium gas filled lamps. The lamps glow bright green in the dark and have white outlines that show as white spots in the daylight. These sights are impervious to solvents and puncture. Important Note: If marked "H3" on metal site, then the product contains tritium gas and is a "night sight". Night Sights are regulated by the US Nuclear Regulatory Commission. The sight shall not be disassembled or exported. The original owner of this product is entitled to replacement or repair (at our option) if the sight fails (a total loss of illumination) due to defects in material or workmanship during normal use, for a period of 5, 10, or 12 years, depending on the product model. This item is in the category "Sporting Goods\Hunting\Gun Parts\Pistol Parts". The seller is "maisem-27" and is located in this country: US. This item can be shipped to United States.