Combat optics, like the rest of the weapon system, need to be 'ready to go' at a second's notice. Guarantee that readiness with our new iO MRO Cover. Trijicon offers up a first-rate Reflex Sight with unique features, make sure you protect its lenses from dust, rain, mud and snow. The sleek iO protective armor body boasts integral snug-fitting lens caps that can be opened or closed with one hand. The solid lens caps nest together, to prevent flopping under recoil and stay clear of both eyes during optic viewing. iO covers feature an indestructible polyurethane material that takes most spray paints and hydro-dip process. Fits Trijicon MRO optics only..