Burris

The FastFire 3 is the best selling red dot sight from Burris. It is available with a 3 MOA or 8 MOA dot. - 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. - Automatic brightness sensor adjusts brightness to match the environmental conditions; also has 3 manual brightness settings - Battery access is conveniently located on the top of the sight; automatic time-out feature after 8 hours helps battery last up to 5 years - Available with Picatinny/Weaver mount for mounting on rifles handguns and tactical shotguns - Available with No Mount which allows you to match it with the perfect mount for your use whether it's sidearm co-witness on an optic like an AR-332 shotgun or even the Burris Spotting scope. See a full ist of mounts here.