The SpeedBead shotgun sight incorporates the excellent FastFire red dot optic with an integral mount that secures the setup between the shotgun's receiver and stock, positioning the sight in the perfect location right over the barrel rib. Thus, there's no need to change your shooting style or head position to take advantage of the benefits offered by a red dot sight. The FastFire features a parallax-free 8 MOA red aiming dot, automatic brightness control, multicoated lenses and weights a feathery 2 ounces. Powered by a single CR1632 lithium battery (included). 12 Gauge Only.