The EOTech G43 is a 3x fixed magnifier that pairs behind an EOTech holographic sight to extend your effective range. It ships with the Switch-to-Side (STS) mount so you can swing the magnifier off-axis and return to 1x without tools. Features: 3x fixed magnification Includes the Switch-to-Side (STS) Picatinny mount for tool-free transition to 1x Designed to pair behind EOTech holographic sights 2.50" eye relief Roughly 7.5deg field of view Adjustable diopter for a sharp image Anti-fog coating Mounts on any Picatinny rail with the included STS mount.