The Midas MG51 by Athlon Optics was designed to provide shooters with the ability to quickly transition between magnified and non-magnified shooting. The MG51 mounts behind a standard red dot sight, swings out of the way when not in use, but can rapidly be deployed to provide your red dot sight 5x magnification for mid to long range shots. This magnifier is well suited for use on modern sporting rifles and is perfect for use in the field or in competitions. Features of the Athlon Optics Midas MG51:Enables quick transition between magnified and non-magnified aiming For use with red dot sights 5x magnification Waterproof, fog-proof, recoil proof Athlon Midas MAG51 - 5x30mm Magnifier 403050