The Master Series Aetec Rifle Scope is loaded with some of the most advanced optical technology available. Aspherical lenses and fully multi-coated optics create a clear, sharp image, and an exterior HydroShield coating provides excellent wet weather performance. 1/4 MOA windage and elevation adjustments are consistent throughout the elevation range. These rifle scopes are waterproof, fogproof and shockproof, with true 1 piece tube construction. Covered by a limited lifetime warranty.