Sightmark SM13017CDX 4-16x44 CDX Illuminated Scope Circle Dot Duplex Reticle. Sightmark now features a Circle Dot Duplex reticle that adds to the line of award winning Sightmark Triple Duty riflescopes. Sightmark's Circle Dot Duplex reticle is based on the World War II German Sniper Rifle, designed for moving targets and quick target acquisition. The Sightmark 4-16x44 Triple Duty Riflescope uses cutting edge glass with fully multi-coated optics, increasing clarity and making it one of the best riflescopes on the market. The fully multi-coated optics transmit a bright and crisp picture that makes tracking and shooting targets quick and easy. The 4-16x44 features a one-piece 30mm tube that increases light transmission and field of view. O-ring sealed and nitrogen purged, the 4-16x44 is both fog proof and water resistant. This precision scope features a parallax adjustment knob and oversized, locking windage and elevation turrets with 1/8" MOA clicks, providing an additional level of accuracy and ensures that the scope stays zeroed. The Triple Duty series of riflescopes are complimentary to any shooter?s arsenal. Limited Lifetime Warranty.