Aimpoint ACRO S-2 1x 9 MOA Red Dot Reflex Sight with Integrated Shotgun Rib Mount Black. The optic was designed to mount on ventilated shotgun ribs. The mounting brackets included with sight allow the optic to be utilized on most standard shotguns. Its large 9 MOA red dot simplifies lead visualization enhancing the automatic refinement of muzzle swing and positioning. The optic is sleek with no protruding features providing a clear field of view with both eyes open. The low optical axis of 15 mm allows proper gun mounting. The Acro S-2 excels in bird and small game hunting as well as sporting applications. Specifications for Aimpoint ACRO S-2 Red Dot Reflex Sight w/ Integrated Shotgun Rib Mount: Manufacturer: Aimpoint Color: Black Finish: Anodized Fabric/Material: Reinforced Polymer/Aluminum Magnification: 1 x Reticle: 9 MOA Illumination Color: Red Eye Relief: Unlimited Adjustment Click Value: 1 MOA Emitter Type: Open Battery Type: Lithium Metal CR2032 Operating Temperature: -20 - 140 Fahrenheit Weight: 2.4 oz Red Dot Sights-Footprint: RMR Features of Aimpoint ACRO S-2 Red Dot Reflex Sight w/ Integrated Shotgun Rib Mount: 50000 hours (over 5 years) of operation on one battery Fits most ventilated shotgun ribs on the market Ultra -low integrated shotgun rib mount - Interchangeable base plates included to accommodate most rib sizes (.24 to .47in or 6-12mm) Height of Optical Axis 15 mm (0.6 in) measured from top surface of mechanical interface Ultra -low integrated and carbon fiber reinforced rib mount - Interchangeable base plates included to accommodate most rib sizes (6-12mm 10 intensity settings with higher maximum settings for bright sky condition Waterproof lightweight compact and fully enclosed protective housing Package Contents: Aimpoint ACRO S-2 Red Dot Reflex Sight w/ Integrated Shotgun Rib Mount Interchangeable Base Plates Base Plate Selection Guide CR2032 Battery Aimpoint Tool Aimpoint 200907: ACRO S-2 1x 9 MOA Red Dot Reflex Sight with Integrated Shotgun Rib Mount Black