The Vanguard Endeavor RS Scope optical design pairs premium Japanese HOYA ED glass with multiple anti-reflective coatings, leading to superior light transmission and a clear and crisp view of the target. This scope is nitrogen purged to eliminate fogging due to temperature changes. High-contrast, bright imagery allows the user to shoot more accurately with less eye strain, even in low light. Simple and intuitive adjustment controls give the user precise sightings. The Rapid Focus Eyepiece provides quick and clear target acquisition. The Endeavor RS has a single tube construction from high grade T6061 aluminum. The standard tube makes it easy to mount with a broad range of available rings. Equipped with the Etched BDC reticle which is great for targeting based on wind, distance, and elevation.