The Burris SpeedBead mount makes it easier to mount your Fastfire I, II or III on your favorite shotgun. With a mount for a majority of the most popular hunting and sporting shotguns, the SpeedBead mount easily installs between the rear stock and receiver in minutes. The SpeedBead is perfect for the wing shooter or sporting clays enthusiast. Mounting low and in line with your natural shooting position, the SpeedBead eliminated the need for perfect form while providing a consistent sight picture through your FastFire optic. The mount comes with risers to position your sight higher for more comfortable shooting and provides a rock solid platform for your FastFire optics. Features:Compatible with 12 gaugeAll Speed Bead mounts are compatible with all FastFire red dot sightsMounts the optic between the stock and receiver with 2 screwsLow mounting system means your line of sight falls just above the vented ribAllows for accurate and instinctive aiming