KANDAR 3-9X40ME Shooting & Hunting Riflescope are best suitable for.177,.22 caliber airguns. Kandar 3-9X40ME is equipped with fully coated optics, and it has generous eye relief and a variety of configurations.It also comes with Eye relief extension tube for better eye vision and concentration. It has parallax setting from 20 yards to infinity.This item is an excellent choice for most hunting situations or target practice. The kander 3-9x40ME scope features a duplex floating reticle and it has a maximum elevation and windage of 30/30. This optic offers 3-9x magnification with a 40mm objective lens diameter.The simple to mount design fits securely on a rifle, and the scope can be easily adjusted with the large dials.