The most demanding situations and the most demanding shooters call for the Leupold Mark AR MOD 1 Riflescope, 4-12x40mm. This new tactical optic squeezes every millimeter of accuracy potential from your MSR/AR or bolt-action rifle, lighting the way to success with optional daylight-visible green FireDot illumination. The tactical riflescope is sturdy, durable and made with high quality for premium performance and long-lasting use. This Leupold Mark AR MOD 1 Riflescope, 4-12x40mm makes an ideal addition to all of your hunting and shooting needs. It works like a telescope. Light passing through the objective lens focuses on a point inside the scope. The ocular lens magnifies the light from the focal point and when you look through a scope, the image you see is that light.