The 2x20 Edge Pistol Scope from BSA Optics is a lightweight scope designed for small calibers and air guns. This scope has a parallax set for 50 yards and windage and elevation adjustments are set for 1/4 MOA with an adjustment range of 45 MOA. Includes fully multi-coated optics providing a clear sight picture that allows for almost instant target acquisition. This scope has a generous eye relief of 11-20 inches which allows it to be used as a scout scope. This scope has a 1? tube diameter and is waterproof, fog proof, and shockproof.Features:2x20 scope for pistols or airguns;1/2 MOA click value;45 MOA windage and elevation adjustment range;1" diameter tube;Waterproof, fog proof, and shockproof contruction