Milled from one solid piece of aircraft grade aluminum to withstand constant heavy recoil; Fog proof and shock-resistant housing; Nitrogen charged with weather resistant seals; Green fused multi-coated lens provides superior light transmission, resolution and scratch resistance; Windage and elevation adjustment; Flip-up lens covers protect from dust and scratches while not in use; 2.7 - 3.3 Inch eye relief provides safety from heavy recoil and enables fast target acquisition; Weaver / Picatinny 1913 ring mounts included