The Diamondback — loaded with features! First, the solid one-piece aircraft-grade aluminum alloy construction makes the Diamondback riflescope virtually indestructible and highly resistant to magnum recoil. Argon purging puts waterproof and fogproof performance on the agenda, and advanced fully multi-coated optics raise an eyebrow when crystal clear, tack-sharp images appear in the crosshairs. Look for all this and more in a riflescope you'd expect to cost quite a bit more-but doesn't. We can live with that. 3-9x40 riflescope is ideal for big game, muzzleloader, and slug shotgun applications. Dead-Hold BDC reticle has a customized design that helps eliminate guesswork on hold-over and windage corrections. Good for any hunting or shooting at varying ranges where estimating hold-over would be a concern. Magnification: 3-9 x Objective Lens Diameter: 40 mm Eye Relief: 3.3 inches Field of View: 44.6-14.8 feet/100 yards Tube Size: 1 inch Turret Style: Capped Adjustment Graduation: 1/4 MOA Travel per Rotation: 15 MOA Max Elevation Adjustment: 70 MOA Max Windage Adjustment: 70 MOA Parallax Setting: 100 Yards