Vortex Diamondback 4-12x40mm RiflescopeThe Diamondback has a solid one piece aircraft grade aluminum alloy construction that makes it virtually indestructible and highly resistant to magnum recoil. Argon purging makes it waterproof and fogproof and advanced fully multi coated optics make for a crystal clear, tack sharp image in the crosshairs. The Dead Hold BDC (MOA)is a customized dot design that eliminates guesswork on holdover and windage corrections. Good for hunting and target at