The serious hunter's scope, custom made to work with the AR15 rifles. Fast, accurate, precise, and rugged. The Nikon M-223 2-8x32mm Waterproof Riflescope features fully multicoated optics, reducing internal reflections and boosting light transmission as high as 95%. The rugged external housing is totally sealed and completely waterproof, for fog-free, shockproof performance backed by Nikon's lifetime warranty with all the superior optical quality Nikon offers. The Nikon M-223 2-8x32 Riflescope w/ ClearCoat Optical is engineered for the 223 Rem./5.56mm NATO round with 55-grain polymer tip bullet. Equipped with Nikon's latest reticle and adjustment technologies.