4-16×44 AOYU Variable Rifle Scope.  The 4-16x long-range optic adopts a solid one-piece 30mm T6 6061 aluminum tube, supplied with a detachable sunshade to cut bright glare. The 44mm green coated objective lens delivers high light transmission for crisp, bright sight images at dawn and dusk. Adjustable diopter eyepiece sharpens the reticle for your eyesight, with comfortable eye relief to buffer recoil.