This is an attachment for all the existing Shade Foregrips, adding a rail segment to the bottom of the grip. This allows you to mount and stack additional attachments like flashlights, lasers, more foregrips, etc.... The picatinny insert slides into the bottom of the grip. New side panels replace the old ones and hold a bolt (M5x25mm) and a hex nut to secure the insert. The design of the new parts is downward compatible with all the existing Shade designs without any modifications. I've included blank and hex-pattern side panels. Again like always the .stp file with panels and insert is included.

Thanks to user 'TheFrenchiestFry' who suggested the rail on the bottom!