Notice:If you need to install it on your g5/g6 slingshot,you need to purchase the 20mm rail first which is in our shop. Product Feature Constructed by aluminum alloy with anodized matte black processing. 1x Magnification,22x33mm reflex lens provide ultra-wide view. Anti-glare reflective coated lens provide excellent optical clarity. Ultra-low parallax & unlimited eye-relief. A 3-position rheostat illumination (Red & Green) Fully adjustable windage and elevation With integrated mount for most 20mm Weaver/Picatinny/RIS rai [4 Selectable Reticles]: This dot sight scope is installed with 4 reticle patterns ( star, cross, bulleye and dot) , which provide various choices in different occasions. And it is easy to transform the patterns even when using. Package Include: 1 x Reflex Sight 1 x Lens Cover 1 x CR2032 Battery 2 x Allen Wrench 1 x Lens Cleaning Cloth