The Sig Sauer ROMEO-M17 Enclosed Red Dot Sight is a MIL-SPEC optic specifically engineered for the SIG SAUER M17 and M18 pistols, as chosen by the U.S. Military. Designed with SIG-LOC mounting for a secure fit, it offers unmatched performance with a fully enclosed, sealed optical system and a 2 MOA red dot/32 MOA circle reticle, independently selectable for versatility. Built with a rugged 7075 aluminum housing and anti-reflection grooves, it ensures durability and glare reduction. Featuring MOTAC and MAGNETAC technologies, 15 brightness settings, and a side-mounted CR2032 battery, the ROMEO-M17 delivers up to 50,000 hours of runtime for dependable performance in any condition.