The cantilever mount allows the attachment of Aimpoint, Burris or other 1" (one inch) red dot sights to rifles and carbines with Flat Top upper receivers or Picatinny rails. The mount allows co-witnessing of the rifle sights with the red dot sight. The mount is held securely in place by a spring loaded locking bar. An extra battery is concealed under a spare turret cover for Aimpoint M3 optics. Manufactured from hard anodized aircraft grade aluminum. All hardware included. No permanent modification required.