Ultimate Arms Gear Tactical Micro Compact Red Dot Open Reflex Sight With Pistol Rifle Shotgun Integral Weaver Picatinny Mount Base Lithium CR2032 Battery, Protective Cover, Windage & Elevation Dial Tool, And Lens Cleaning Kit All Included Glare Free, Shock Proof & Fully Coated With An Anodized Finish For Heavy Duty Recoil And Includes A Lifetime Manufacturer's Warranty Lightweight Super Compact And Crystal Clear Parallax Free & Unlimited Eye Relief Provides The Shooter A Wide Field Of View And The Ability To Operate With Both Eyes Open Perfect For Rifles, Pistols, Shotguns, Paintball, Airsoft Or Crossbows With a 7/8" Weaver-Picatinny Rail