Designed to handle the recoil of your toughest magnum Burris Pistol Scopes offer fully multi-coated optics for an exceptionally bright view. These variable power pistol scopes have 1/4 MOA windage and elevation adjustments. Waterproof fogproof and shockproof. Burris Pistol Scopes are covered by the Burris Forever Warranty. - Tube Diameter: 1 - Objective Bell Diameter: 39mm - Ocular Bell Diameter: 38mm - Adjustment Click Value: 1/4 moa - Eye Relief: 10-21 - Exit Pupil Diameter: 16-4.9mm