The AR-F3 Flattop FastFire Sight for AR and Carbine shooters. The FastFire 3 with 3 MOA dot and a rugged protective mount is range-ready right out of the box. The AR FastFire 3 can be used as a stand-alone sight or as a co-witness for iron sights. Features the AR-F3 Tactical mount. Positions the FastFire at the optimum height on an AR as a standalone sight and as a co-witness for iron sights. It Features metal wings on each side of the lenses that protects the sight from impact or unintentional abuse; a lower compartment for spare battery storage; fits any Weaver or Picatinny-style base; manual push-button automatic brightness adjustment.