100% Night Fision Made in the USA or Imported OUTSTANDING BRIGHTNESS: Night Fision offers innovative night sights with brighter, more vivid aiming dots which utilize self-illuminating Tritium for a constant glow, making them highly effective; the sights contain 30% more Tritium than most competitors do SHARP SIGHT PICTURE: The domed lens of the sights collimate tritium rays, which helps to provide a sharper sight picture, this feature allows the shooter to have a clearer view of their target, making it easier to aim accurately; instead of a painted-on ring, the Tritium insert is surrounded by a daylight fluorescing material, ensuring optimal visibility in daylight OPTIC READY STEALTH SERIES: The sights from Night Fision are specifically designed for a lower 1/3 co-witness with slide-mounted red dot sights; ORS sights are engineered from the ground up to serve as backup sights for red dots, they minimize obstruction of the optic window while still allowing three-dot sight alignment if necessary COMPATIBILITY: These night sights are designed to be compatible with Sig Sauer P320/P365 guns and engineered for an approximate lower 1/3 co-witness with popular optics such as Holosun EPS Carry with a plate system, Holosun SCS 320 with a plate system DURABLE CONSTRUCTION: Night Fision Optics Ready Stealth Night Sights are CNC machined out of high-quality steel and have Matte black Nitride finish, which makes the sights robust, sturdy, corrosion-resistant, and able to withstand heavy use and recoil; rugged machined steel sight bodies serrated for glare reduction