The Shield Sights SMS2 Mini Sight 2 is an updated version of the famous original mini-sight designed as the first red dot sight developed specifically for pistols. Features a 4 MOA dot reticle and improved glass-filled nylon polymer construction with Si02 Quartz hard coating for enhanced durability.Shield Sights SMS2 Mini Sight 2 Reflex Sight4 MOA dot reticle for precise targetingGlass-filled nylon polymer constructionParallax free designCR2032 3V lithium battery poweredNight vision compatibleLow profile design allows co-witnessing with iron sightsRear iron sight notch integrationEngineered for seamless pistol integration with an incredibly low profile that sits close to the bore-line providing trained shooters with a natural presentation and improved shooting experience without obstructing vision or requiring backup sights.