Firefield black reflex sight is compatible with AR platforms, bolt actions, shotguns, air rifles & some handguns. Quick and accurate target acquisition. Unlimited eye relief. Adjustable reticle brightness. Choice of 4 reticle patterns, 3 MOA dot, crosshair, 10 MOA dot, crosshair and 6.5 MOA circle with 3 MOA dot. Includes adjustment tools, lens cover and battery. 1X power. Objective apperature 33X24 mm. 1 click=1MOA.