Optimize your hunting shotgun with Aimpoint’s Acro S-2. Based on the Acro 2nd generation, the S-2 is specifically designed to mount to ventilated shotgun ribs and excels at small game and bird hunting as well as skeet shooting. It comes with interchangeable base plates to accommodate the most popular shotgun rib sizes, and sits low on the rib so shooters don’t have to raise their head to get a sight picture. The S-2 features a large window to accommodate shooting with both eyes open, and the 9 MOA dot allows shooters to visualize shot patterns and promote fast target acquisition. Like all Aimpoint products, the Acro S-2 boats excellent durability thanks to a its high-strength anodized aluminum housing. Features of the Acro S-2:Anodized high strength aluminum housing with semi-matte black finish9 MOA red dot for fast target acquisitionBattery life 50,000 hours (over 5 years) of constant operation on a single batteryBattery type: CR2032 (included)Integrated rib mount, carbon fiber reinforced polymerInterchangeable base plates included to accommodate most popular shotgun rib sizesSleek design, and larger window, contributes to a clearer field of view with both eyes openVersatile optic for all shotgun applicationsUltra-low optical axis Aimpoint Acro S-2 9 MOA Red Dot Reflex Sight w/Integrated Shotgun Rib Mount 200907