The Vanguard Endeavor RS rifle scopes superb image quality is delivered through multilayer anti-reflective coatings for increased light transmission and optical designs using premium Hoya ED glass.Featuring robust construction, the scope is engineered to handle rugged terrain and deliver spot-on accuracy.Large fields of view, a rapid focus eyepiece and enhanced contrast combine to deliver a positive experience afield.The single-piece 1" tube is constructed from high-grade t6061 aluminum.Its hard, anti-scratch, anodized matte surface delivers a robust and ergonomic platform.The endeavor rs is sealed against dust and moisture, nitrogen-purged and recoil-resistant to provide a lifetime of dependability and success.Precise windage and elevation adjustments offer reset capability and accuracy with a locking side parallax system on certain models.The endeavor rs is engineered to handle rugged terrain in the most challenging conditions.Vanguard manufactures the endeavor rs in its own factory to ensure the highest quality from start to finish.