Vortex Diamondback 3-9x40mm BDC

Second Focal Plane - Reticle Scale of reticle maintains the same ideally-sized appearance. Listed reticle subtensions used for estimating range, holdover and wind drift correction are accurate at the highest magnification.

Tube Size - 1 inch diameter tube offers a versatile blend of adjustment, size and weight for a wide variety of shooting applications.

Single-Piece Tube - Maximizes alignment for improved accuracy and optimum visual performance, as well as ensures strength and waterproofness.

Aircraft-Grade Aluminum - Constructed from a solid block of aircraft-grade aluminum for strength and rigidity.

Waterproof - O-ring seals prevent moisture, dust and debris from penetrating for reliable performance in all environments.

Fogproof - Argon gas purging prevents internal fogging over a wide range of temperatures.

Shockproof - Rugged construction withstands recoil and impact.

Hard Anodized Finish - Highly durable hard-coat anodization provides a low-glare matte surface and helps camouflage the shooter's position.

Capped Reset Turrets - Allow quick re-indexing of the turret (no tool needed) to zero after sighting in the riflescope. Caps provide external protection for turret.

Precision-Glide Erector System - This system ensures the components in the zoom lens mechanism glide smoothly and cleanly through all magnification ranges.

Fast Focus Eyepiece - Allows quick and easy reticle focusing.