The Burris AR-F3 Fast Fire Mount is the easiest way to mount the FastFore II on an AR flattop to be used as a standalone and can be used as a co-witness for iron sights. This mount has a spare compartment for carrying a spare battery a Torx wrench and an open end wrench. The FastFire is designed to sit inside the mount of a weapon for extra protection fits any Weaver or Picatinny base and has an attractive black matte finish.