KANDAR 4-16X40AOME Illumination Recticle Riflescope are best suitable for.177,.22 caliber airguns. Kandar 4-16X40AOME 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 4-16x40AOME scope features a duplex floating recticle 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.