A long eye relief, locking diopter, and fully multi-coated lenses are just a few of the reasons the Vortex Copperhead 4-12x44 Riflescope is such a likeable scope. Tough construction and bright images are even more enjoyable. It’s matte black anodized single-piece aircraft-grade aluminum tube is nitrogen-purged and o-ring sealed for waterproof/fogproof/weatherproof performance and 1-in aluminum grade tube make this a great scope.