For AR and carbine shooters, the AR-F3 combines the FastFire? III sight with the rugged AR-F3? mount. It?s the simplest and most effective way to mount any FastFire? sight on an AR flattop as a standalone sight or as a co-witness for iron sights. The FastFire sits low in the mount. Metal wings on each side of the lens protect the sight from impact or unintentional abuse. A lower compartment offers convenient storage for a spare battery, open-end wrench, and Torx(R) wrench. Fits any Weaver or Picatinny-style base. Bundles a FastFire III 3-MOA sight with the rugged AR-F3 mount, creating a convenient package for first-time FastFire owners Protects FastFire optics Ideal for multi-gun shooters Clear Objective Lens Diameter: 21x15 mm Illumination Control: Manual push-button & automatic brightness adjustment Illumination Settings: 3 manual brightness levels; automatic setting reactive to environment The mount?s height is sufficient to co-witness with flip-up sights Bright red dot allows for fast target acquisition and easy aiming Compact and lightweight, so it won?t affect firearm balance or handling 1x magnification allows both-eyes-open shooting, for enhanced awareness and target acquisition Parallax-free, for better accuracy Fits any Weaver or Picatinny-style base for easy mounting Windage and elevation adjustments make fine-tuning easy Easy access to illumination controls High-grade optical glass provides excellent brightness and clarity, with lasting durability Index-matched, Hi-Lume(R) multicoating provides low-light performance and glare elimination Waterproof Durable and rugged, with shockproof design that stands up to years of punishing recoil Features a compartment for carrying a spare battery and open-end wrench or Torx(R) wrench Comes with our Burris Forever Warranty BLEMISHED products may or may not include accessories.