Tactical Red Dot Laser Sight Scope 20mm Standard Pistol Gun Mount Great Laser for 4 Inches Barrel 22, 32, 380, Picatinny Weaver Rail The item adjustment for windage and elevation illuminated cross-hairs for day & night shooting. Cross-hair being used instead of the traditional front sight and notch base the aiming speed, accuracy and percentage of hits are greatly increased. Its outer covering is made of high - strength aluminum alloy and undergoes special anti-corrosive treatment, and the surface of all the optical spare parts are plated with anti-reflection coating. It is anti vibration, fog-proof and shock-resistant. Fits standard 20mm Weaver and Picatinny rails.