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 ownersProtects FastFire opticsIdeal for multi-gun shootersClear Objective Lens Diameter: 21x15 mmIllumination Control: Manual push-button & automatic brightness adjustmentIllumination Settings: 3 manual brightness levels; automatic setting reactive to environmentThe mount?s height is sufficient to co-witness with flip-up sightsBright red dot allows for fast target acquisition and easy aimingCompact and lightweight, so it won?t affect firearm balance or handling1x magnification allows both-eyes-open shooting, for enhanced awareness and target acquisitionParallax-free, for better accuracyFits any Weaver or Picatinny-style base for easy mountingWindage and elevation adjustments make fine-tuning easyEasy access to illumination controlsHigh-grade optical glass provides excellent brightness and clarity, with lasting durabilityIndex-matched, Hi-Lume(R) multicoating provides low-light performance and glare eliminationWaterproofDurable and rugged, with shockproof design that stands up to years of punishing recoilFeatures a compartment for carrying a spare battery and open-end wrench or Torx(R) wrenchComes with our Burris Forever WarrantyBLEMISHED products may or may not include accessories.