Burris FastFire sights are small, light, and tough. The powerful bright red dot makes target acquisition easier than every before. It can be used as a primary sight, or a pair on top of an existing optic or laser. The electronics and chassis of FastFire sights are built tough, so they can handle the abuse of competition and hunting. Burris Optics prides itself on being an innovator in the optics industry, and the FastFire series of sights continues that tradition. Similar to other Burris products, the warranty is forever. Burris FastFire Features: Bright-red dot allows for fast target acquisition and easy aiming Parallax-free, for better accuracy Index-matched, Hi-Lume multicoating provides low-light performance and glare elimination Windage and elevation adjustments make fine-tuning easy High-grade optical glass provides excellent brightness and clarity, with lasting durability Waterproof Nitrogen-filled body tubes prevent internal fogging in the cold and rain Shockproof design stands up to years of punishing recoil Burris FastFire II 4 MOA Dot 300233