The SpeedBead System is the FastFire 3 with 8 MOA dot, and specially designed SpeedBead mount. Apply the ease, speed, and accuracy of a red dot sighting system to your favorite shotgun with this unique mounting system.The SpeedBead mounts a FastFire optic between the stock and receiver of many popular shotguns. Your line of sight will fall naturally just above the vented rib, allowing for accurate and instinctive aiming. At 1x magnification, it's designed for both-eyes-open shooting. That's ideal for shooting clays and hunting waterfowl, upland birds, and turkeys.Features:Mounts low between the stock and receiver.Line of sight falls just above the vented rib for accurate aiming.1x magnification allows both-eyes-open shooting.Parallax free, for improved accuracy.CR-1632 battery with automatic time-out feature lasts up to 5 years.