The Trijicon Miniature Rifle Optic (MRO) is a reflex-style sealed sight intended for use on rifles carbines and shotguns to provide fast target acquisition. It is designed to be used with both eyes open providing the operator with maximum situational awareness. Features Full Cowitness Mount AC32068. The large aperture and tapered light path maximizes the viewing area in such a small optic allowing for fast target engagement especially from non-standard shooting positions. It also features ambidextrous brightness controls sub-flush adjusters advanced lens coatings and a fully sealed waterproof hard anodized forged 7075-T6 housing making the MRO the ultimate mini reflex sight.The MRO HD is optimized for use with a magnifier with a re-engineered objective lens to produce a refined 2.0 MOA center dot surrounded by a 68 MOA segmented circle multiple reticle system. The ambidextrous reticle and brightness control allows the user to choose between a full reticle or center dot only. The MRO HD features 16 total brightness settings 8 for each reticle option 5 Daytime 1 Super Bright 2 Night Vision.