Vortex Viper HS LR 4-16x50 Riflescope (Dead-Hold BDC MOA Reticle)Vortex Optics riflescopes boast extreme durability, high mechanical precision, and superior high definition optics. The Viper HS LR 4 16x50 Riflescope was carefully crafted and meticulously designed to make this rifle scope the ideal optical solution for a long range tactical applications. The Viper HS LR 4 16x50 brings you exceptional image quality thanks to the XD (extra low dispersion) optical glass. The 50mm objective lens features a BDC reticle