Supplied with 9/11mm mounts for traditional 9-11mm width dovetails/rails. If you have a 20mm wide weaver/picatinny base then additional mounts need to be purchased. Please ask us if unsure. 2x fixed magnification Long eye relief for use at arms length. 20mm lens 1" tube tube Parallax error-free at 35 yards. Aircraft grade alloy mounts: 9-11mm Dovetail Complete with allen key, PAO lens cloth and user manual 30-30 Duplex Reticle Aircraft grade aluminium alloy tube Completely sealed and nitrogen purged Fog proof, waterproof and shockproof Smooth and accurate operation Sapphire gem clarity multi layer lens coating Finger adjustable windage and elevation turrets Adjustable focus eyepiece for rapid focus adjustment PAO Lifetime "No quibble" 'New-for- old replacement -not Repair-Warranty.