The Trijicon MRO (Miniature Rifle Optic) is a sealed miniature reflex sight intended for use on rifles carbines and shotguns to provide fast target acquisition.The large aperture and tapered light path maximize the viewing area and allow for better situational awareness and fast target engagement - especially from non-standard shooting positions you might encounter while hunting or in military or law enforcement fields. Combine all this with the ambidextrous brightness controls sub-flush adjusters advanced lens coatings and the fully sealed waterproof hard-anodized forged 7075-T6 housing and you have the ultimate mini reflex sight on the market.FASTER TARGET ACQUISITIONLarger viewing area allows for faster acquisition and engagement with reduced "tube effect."AMBIDEXTROUS BRIGHTNESS CONTROLBrightness dial is equally usable by left- or right-handed operators without having to remove hand from fire control.EASILY ADJUSTABLE BRIGHTNESS SETTINGSMRO models feature 8 brightness settings including 2 night vision-compatible settings. MRO HD models feature16 brightness settings including 4 night vision-compatible settings. BUILT TO HANDLE THE WORSTDesigned with forged 7075 housing fully sealed construction and dry nitrogen to protect against the tough elements.RECESSED ADJUSTERSCapless design (utilizing sub-flush adjusters) eliminates lost caps snag hazards and ensures against inadvertent adjustment or loss of zero.SUPERIOR QUALITY GLASS LENSESMulti-coated lenses provide superior clarity and light-gathering capabilities with zero distortion for a crisp dot reticle.LONG-LASTING POWERMRO SD Red Dot: 2.5 years MRO SD Green Dot: 3 yearsMRO HD: 2.5 years for dot only 75 days for complex reticle(continuous use at setting 5 of 8)ENHANCED OPTICAL PERFORMANCERe-engineered objective lens allows for enhanced optical performance and magnifier compatibility. IMPROVED WINDAGE AND ELEVATIONDesigned to maintain stricter zero retention requirements under drop and recoil.