Milled from one solid piece of aircraft grade aluminum body to withstand constant heavy recoil. Fog proof and shock-resistant housing. Nitrogen charged with weather resistant seals. Blue fused multi-coated lens provides superior light transmission, resolution and scratch resistance. Windage and elevation adjustment. 8.5 - 10.5 Inch eye relief provides safety from heavy recoil and enables fast target acquisition.Weaver / Picatinny 1913 ring mounts included.