The FastFire 3 is the bestselling red dot sight from Burris. It is available with a 3 MOA dot. Many other mounts are also available. Light and tough, the FastFire 3 series puts an unmistakable, bright red dot on your target to give you an immediate speed and accuracy advantage. Can be used as a primary sight or paired on top of an existing sight. Features : 3 MOA Bright dot Compact and lightweight design Parallax free Automatic brightness sensor Waterproof Shockproof