The Swamp Fox Kingslayer Micro Reflex Sight Red Circle Dot is a compact open reflex sight designed for rapid target acquisition with both eyes open, offering a durable, feature-rich option for pistols, rifles, and shotguns. On pistol slide platforms, you can remove the included 1913 Picatinny mount and use the RMR-compatible footprint underneath, while mounting with the Picatinny rail enables reliable performance on rifle and shotgun platforms. Built to withstand tough conditions, Kingslayer is waterproof, fog resistant, and features a scratch-resistant anti-glare lens with multicoating, ensuring clear sight picture in varied lighting and weather. With a rugged construction that maintains zero on reciprocating pistol slides, 12-gauge shotguns, and even .308 battle rifles, this compact sight delivers dependable accuracy when every shot counts. The Kingslayer offers versatile reticle options, including a Red Circle Dot at 3 MOA and a Red Dot preference, with a bright 10-level brightness setting and up to 1500 hours of battery life powered by a single CR1632 battery, all in a lightweight 1.3 oz package finished in black for a discreet, low-profile appearance.