Swampfox Optics Kingslayer is a super compact open reflex dot sight allowing you to quickly acquire a sight picture with both eyes open while focusing on the target. For pistol slide platforms remove the included 1913 Picatinny mount and use the RMR-compatible footprint underneath. With the Picatinny mount installed Kingslayer works great on rifle and shotgun applications. Kingslayer is waterproof fog resistant and features a scratch resistant anti-glare lens multicoating. Built like a tank Kingslayer will maintain its zero on reciprocating pistol slides 12 gauge shotguns and even .308 battle rifles. Choose from 3 MOA red dot red circle dot or green circle dot reticles. Battery Life: 1500 hours Brightness Settings: 10 settings Finish: Black Power Supply: (1) CR 1632 Lithium Battery Reticle: Red Circle Dot Weight: 1.3 oz