The Sig Sauer Romeo8 Red Dot Sight is designed for your MSR platform. This Red Dot Sight features 4 reticle options giving you freedom to change up reticle at any moment. Features:Designed for Modern MSR platforms and shotgunsComes standard with solid lens covers and 1/2 hex bolt mountBallistic Circle-Dot reticle optionsUsers can select from 4 different integrated reticle options (Dot, Circle-Dot, Dot with Holds, Circle-Dot with Holds)100,000+ hour battery life and the readily available CR123A battery is side loading for quick battery replacementUnlimited eye relief to acquire aiming point and target, regardless of eye positioning behind sightMOTAC (Motion Activated Illumination) powers up or down when sensing motionUses an ultra-efficient red LED illumination for daylight visibility and extended runtime1.535" Mount HeightStrong, lightweight aircraft-grade 7075-T6 aluminum housingWaterproof, IPX-8 rated, and fog-proof