Vortex Optics Copperhead 4-12x44 Riflescope - Dead-Hold BDC Reticle (MOA) Specifically designed for hunters and shooters, the Copperhead riflescope offers the highest levels of performance and reliability. The Dead-Hold BDC is good for hunting and shooting at varying ranges where estimating hold-over is a concern. Fully multi-coated lenses increase light transmission with multiple anti-reflective coatings on all air-to-glass surfaces. The long eye relief, locking diopter are just a few of the reasons this riflescope is a crowd pleasing favorite. Its hard anodized single-piece aircraft-grade aluminum tube is nitrogen purged and o-ring sealed for waterproof/fogproof/ weatherproof performance.