Designed for mid to long-range use, the Hawke Optics 4-12x40 Vantage AO IR Riflescope boasts a partially-illuminated crosshair reticle with five selectable brightness levels for use in most lighting conditions in either red or green. Red is ideal for low-light conditions, while green is easier to see in brighter ambient light or when using NVDs in extreme low-light or complete dark. The 40mm objective draws in copious amounts of light versus smaller objectives while maintaining a low profile. Covered turrets help guard against accidental adjustments while a fast-focus collar and knurled rheostat allow you to quickly adapt to rapidly changing situations. Complementing the performance of the scope is a lightweight and durable anodized aluminum housing, with a 1" one-piece maintube that is nitrogen-filled and O-ring sealed to be water and fogproof.