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DIAMONDBACK 4-12X40 RIFLESCOPE 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. 4-12x40 riflescope is ideal for big game, predator/varmint, muzzleloader, slug shotgun, and long range 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. OPTICAL FEATURES Fully Multi-Coated Lenses Increase light transmission with multiple anti-reflective coatings on all air-to-glass surfaces. CONSTRUCTION FEATURES One-Inch Tube Standard tube diameter for most American riflescopes. One-Piece Tube Maximizes strength and waterproofness. Aircraft-Grade Aluminum Premium grade of aluminum, valued for fatigue resistance. Precision-Glide Erector System Uses premium components in the zoom lens mechanism, ensuring smooth magnification changes under the harshest conditions. Fast Focus Eyepiece Allows quick and easy reticle focusing. Low Capped Turrets Is less susceptible to accidental impact damage. Reset Turrets Allow re-indexing of the turret housing to zero after sighting in the riflescope—generally requires use of a coin or wrench. Waterproof Optics are sealed with o-rings to prevent moisture, dust, and debris from getting inside the binocular. Fogproof Barrels are filled with argon gas to inhibit internal fogging. Shockproof Lenses are locked in place, fore and aft, with machined locking rings to remain in perfect alignment and withstand recoil and impact. Hard Anodized Finish Hard-coat anodization is durable; the low-glare matte helps camouflage the shooter’s position. Magnification 4-12 x Objective Lens Diameter 40 mm Eye Relief 3.10 inches-3.40 inches Field of View 32.4-11.3 feet/100 yards Tube Size 1 inch Turret Style Low Capped Adjustment Graduation 1/4 MOA Travel per Rotation 15 MOA Max Elevation Adjustment 60 MOA Max Windage Adjustment 60 MOA Parallax Setting 100 yards Length 12 inches Weight 14.6 ounces Product Manual (PDF) Download Product Manual 2 (PDF) Download DEAD-HOLD BDC RETICLE (MOA) Customized dot design helps eliminate guesswork on holdover and windage corrections. Good for hunting/shooting at varying ranges where estimating holdover is a concern.