The Burris AR-F3™ 1 x 32 Flattop FastFire Red Dot Scope is a simple and effective way to mount a FastFire™ sight on an AR or carbine shooter flattop as a standalone sight or a co-witness for iron sights. While 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 or Torx® wrench. Fits most Weaver or Picatinny-style bases. Waterproof.