Designed for fast, responsive target acquisition and accuracy, the ROMEO1PRO miniature open-reflex red dot sight was engineered to withstand the punishment of harsh environments. With an upgraded emitter for superior brightness and outstanding battery life, the ROMEO1PRO is capable of mounting to any SIG SAUER pistol or any other pistol machined to accept the ROMEO2 / PRO reflex sight interface and mounting hole spacing using the included M4 mounting screws.