Many times when in the field or during competitions you need to transition between no magnification for speed in close-range combat and magnification for precision shooting as situation dictates. The Athlon magnifiers mount behind a traditional red-dot sight to provide magnification when needed. Featuring:  Fullymulti Coated Lenses, Adjustable Illumination Settings, Aircraft Aluminum, One Piece Chassis Construction, Nitrogen Purged, Picatinny Rail Mount.