BCA's 1x20 Red Dot sight gives you the best, most robust, compact red dot sight with 1x aiming solution optimized for your AR. With an ultra low parallax so point-of-aim is the point-of-impact and the red dot remains parallel to the bore of your firearm, no matter what your viewing angle is. Unlimited eye relief allows you to acquire the point and the target regardless of the position of your eye behind the sight. Product Description 1x20 Scope Compact Riflescopes Red Dot Sight Objective Diameter 20mmFeatures:High quality full metal bodyGreen and red two switches new stylePull-out style battery house Specifications: MAGNIFICATION: 1x OBJECTIVE LENS DIAMETER (MM): 20 ADJUSTMENT INCREMENTS: 1.0 MOA TOTAL ELEVATION TRAVEL: 100 MOA TOTAL WINDAGE TRAVEL: 100 MOA RETICLE: 2 MOA Red Dot CENTER DOT SIZE: 2 MOA Material Aluminum Alloy