SpecificationsConstruction: MetalMagnification: 4-12XWeight: 1.4 LbLength: 12.9 In.Objective Diameter: 50MmEye Relief: 2-4 In. Field Of View: 13.41-40.38@100YdsReticle: Range FinderOptical Coating: BlueShock Proof: YesOne-Piece: Yes Foa Adjustment: YesNitrogen Filled: YesWaterproof: YesFog Proof: YesTube Diameter: 25.4MmColor: BlackFeaturesIncredibly Tough Tempered Metal Alloy Manufacturing Proves To Outlast And Endure In The Field Against The Elements And Debris.Rugged Nitrogen Filled And Shock Proof Body Enhances Scope Vitality.Windage Adjustment Allows You To Finetune And Improve Your Sight Accuracy.Blue Optical Coating Adds Ease In Visual Alignment Between Operator And Target.Adjustable Picatinny Rail Adapter System Easily Fits 20Mm Rails Making This One Versatile Scope.