Ergo AR-15 Grip 'Gapper'
For use with standard trigger guards only.
Install: Slide the "U" shaped portion of the Gapper over the rear of the trigger guard with the longer side
pointing down and push it forward. If it can not be pressed in, try moistening it, or loosen the grip by untightening the grip mounting screw. After the Gapper is positioned, retighten the mounting screw.