The Swamp Fox Kingslayer is a super compact, highly accurate micro reflex open red dot sight featuring three reticle options that allows for fast target acquisition with both eyes open while focusing through to the target. It is an RMR-compatible footprint for reciprocating pistol slides . For rifle or shotgun platforms, Kingslayer comes with a low profile 1913 Mil-Std Picatinny mount already installed. Kingslayer is waterproof, fog resistant and features a scratch resistant, anti-glare lens coating. Built like a tank, Kingslayer can withstand 800 g's of impact and maintain zero come what may.The crisp 3 MOA dot covers only three inches of target area at 100 yards distance. Kingslayer maintains its zero over time, shot after shot.True 1x sight picture and 10 brightness settings create the opportunity for an instant, lightning fast sight picture and faster follow up shots with both eyes open.The Included CR1632 battery lasts up to 1,500 hours before being swapped out via side tray (no change in scope zero). Kingslayer shuts itself off automatically after 4 hours.