The VORTEX Diamondback 4-12x40 AO Riflescope, Dead-Hold BDC Reticle, Matte Black (DBK-412B) is ideal for big game, predator/varmint, muzzleloader, slug shotgun, long range, and target applications. This model riflescope features the adjustable objective (AO), which uses an adjustment mechanism on the objective lens to fine-tune focus for the purpose of reducing parallax shooting error.
Vortex knows good hunting gets all the better with high quality optics. For that reason, Vortex makes sure every glass surface of the Diamondback is fully multi-coated to transmit 91% of the light - delivering the bright details you need when taking aim.
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.
Precision-Glide Erector System features premium-grade fluoropolymer teflon resin bushings that provide exceptional resistance to stress cracking, temperature change, corrosion, and friction-induced wear. In addition, these bushings have an ultra-low coefficient of friction for the smoothest possible operation of the magnification adjustment.
The Dead-Hold BDC reticle has a customized design that helps eliminate guesswork on hold-over and windage corrections. It is good for any hunting or shooting at varying ranges where estimating hold-over would be a concern.
The Diamondback 4-12x40 AO Riflescope comes with removable lens covers, dust cloth and the VIP Unconditional Lifetime Warranty.
Objective Lens Diameter, mm
Field of View (FOV) @ 100yds, ft
Exit Pupil, mm
Eye Relief, mm
Tube Diameter, in
Click Value, in @ 100yds
0.25" (1/4 MOA)
Windage Adjustment Range, in @ 100yds
60" (60 MOA)
Elevation Adjustment Range, in @ 100yds
60" (60 MOA)
Parallax Setting, yds
10 to Infinity
Adjustable objective (AO) allows maximum precision on small targets
Fully Multi-Coated Lenses increase light transmission with multiple anti-reflective coatings on all air-to-glass surfaces
1 inch 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 Profile Turrets are 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
Due to the nature of this item, it may be restricted from shipment to the territories listed under Shipping Restrictions. It may require a permit or may be prohibited from ownership in these areas. Contact your local law enforcement/government officials to find out more. If you add it to the shopping cart and check out with it, it may be removed from your order by our customer service team (your credit card will not be charged for the item).