Don't you hate having to re-zero your optics every time you remove them? With the KDG SIDELOK mounting system, that's no longer a necessary part of your routine! Thanks to the unique, two-level system used on this mount, the SIDELOK secures onto any Picatinny optics rail without needing tools, levers or large knobs. This particular Short Riser model of the KDG SIDELOK mounting system is purpose-built for use with red-dot magnifiers, compact optics, red-dot sights and other small, rail-mounted accessories. Users can mount an optic, zero it, remove it and re-mount it while maintaining confidence in their optic's zero. Mfg: Kinetic Development Group Overall length: 4.3"