The HM3X 3x Magnifier from Holosun is an aluminum-bodied magnifier for use with a red dot sight. It includes a quick release, ambidextrous, flip-to-side Picatinny rail mount and a spacer that provides compatibility with absolute and lower 1/3 co-witness dot heights. It has a generous 2.75″ of eye relief. Other features include IP67 water resistance plus windage and elevation adjustment for precision zeroing in.