The Leupold Mark 4 1-3x14mm CQ/T is a revolutionary optical sight for tactical firearms such as the AR-15 and M16. Developed in cooperation with both the U.S. military and law enforcement agencies, the Mark 4 CQ/T combines the strengths of a red dot sight and a variable power riflescope. Incredibly tough, 100 percent waterproof, and devastatingly accurate, only the Mark 4 CQ/T is ready and able to handle the variety of close-contact situations common to both law enforcement and the military. Product Specifications Actual Magnification: 1.0 - 2.9 Length (in): 8.8 Eyepiece Length (in): 3.0 Objective Length (in): n/a Objective Diameter (in): 1.2 Eyepiece Diameter (in): 1.5 Tube Diameter (in): 2.9 Weight: 17.5 oz. / 496 grams Eye Relief (in): 2.0 - 2.8 Eye Relief (mm): 51 - 71 Objective Clear Aperture: 0.6in / 14mm Elevation Adjustment Range (MOA): 80 Windage Adjustment Range (MOA): 80 FOV @ 100 yds (ft): 116.6 - 84.3 FOV @ 100 m (m): 38.9 - 28.1 Ring Spacing Max. Mount Ring Spacing (in): 1.6 Additional Product Information: The Circle Dot Reticle a bold aiming point for the operator, and also provides range estimation. Range Estimating with the Circle Dot Reticle Estimating range using the Circle Dot reticle is simple. Place the target inside the circle of the reticle. At 3x the diameter equates to 6 feet in height at 100 yards. At 200 yards, 6 feet is measured from the dot to the edge of the circle. Dot Size: 3 MOA at 3x, 9 MOA at 1x. Circle Size: Edge to edge, the subtension of the circle is 18 inches at 25 yards, or 6 feet at 100 yards when set on 3x. From the center of the dot to the edge of the circle, the subtension is 6 feet at 200 yards when set on 3x. Circle Line: The width of the line creating the circle is large enough to be easily visible, but thin enough so as not to obliterate an 18-inch object at 500 yards when set on 3x.