Ultimate Arms Gear Tactical 4x20 Fine Crosshair Reticle 22 .22 Caliber Rifle And Airgun Paintball , Pellet Gun, Crossbow Or Airsoft Compact Scope + Lens Caps + 3/8" Dovetail Mounting Rings 4x Fixed Magnification , 20mm Diameter Multi Coated Lens, 7/8" Tube Diameter Black Finish, Overall Length : 10.55" , Net Weight: 4oz, Adjustable Windage & Elevation Eye Relief : 2.5", Exit Pupil (mm): 5mm, Field Of View @100yds 26.2 Multi-Coated Lenses For Reducing Light Loss. Magnesium Fluoride Is Applied To Improve Clarity And Reducing Glare Due To Reflection. Includes Protective Lens Caps And 3/8" Rings To Fit On .22 Rifles, Airguns, Airsoft, Paintball With a 3/8" Dovetail Base (not for use on guns with recoil greater than .22 caliber rifles)