For AR or carbine shooters, the AR-F3 combines the popular FastFire III with a rugged protective Picatinny-style mount. The mount has a storage compartment for spare batteries, open-end wrench and torx wrench. The FastFire III features include a top mounted battery ((1) CR1632 or (2) CR2016) for easier battery replacement, upgraded windage and elevation adjustments and a power button that provides three manual brightness settings and an automatic brightness setting with low battery indicator. The AR-F3 includes a FastFire III with 3 MOA dot and includes a protective cover and battery. Just like the rugged FastFire II, the FastFire III features a steel body construction for extreme durability and is 100% waterproof. This ultimate CQB sight is perfect for mounting as a stand alone sight or to co-witness with iron sights on flattop AR-15. Covered by the Burris 1-year factory warranty.