The 4-16x50mm IR Tactical Rifle Scope by BARSKA is the top choice for shooters who are serious about precision optics with unrelenting reliability. The 4-16x magnification features a 4-time zoom ratio perfectly suited for close to mid-range, as well as precision long range shooting. The Glass Etched Trace MOA IR Reticle is set in the first focal plane so as you increase the magnification the reticle will increase in size for accurate range estimation at all magnification levels. The reticle illuminates in red & green with five brightness settings for each color, with only the center of the crosshair illuminating to prevent potential washout of your target and sight picture. The large External Target Turrets are precision designed with tactile & audible (R) MOA adjustments, and include a Zero Reset feature to bring you back to your original zero after adjusting your elevation for extended ranges. The turrets also feature locking set rings to prevent unintentional adjustments. The Side Focus adjustment will focus from 10 yards to infinity eliminating any parallax issues. The large 50mm Objective Lens provides impressive low-light clarity, and all air-to-glass lenses are Fully Multi-Coated for superior light transmission. For accuracy and reliability shot after shot, you can count on the 4-16x50mm IR Tactical Rifle Scope.