The Vortex Diamondback 4-12x40mm Shockproof Riflescope delivers all the power you need for medium to long range hunting. These Riflescopes have pop-up dials that provide easy, precise adjustment of elevation and windage, making audible clicks that are easily and quickly counted. Vortex knows good hunting gets all the better with high quality optics. The Vortex Diamondback 4-12x40mm Riflescope starts with a durable 1″ tube constructed of 6061 T6 aircraft-grade aluminum and is then subjected to demanding factory testing under a force of 1000 G’s – 500 times! These scopes are purged with Argon gas for waterproof and fogproof performance. Count on the Vortex Diamondback 4-12x40mm Hunting Riflescope for smooth handling when the heat is on.