Designed to fit in the INTRAFUSE Stock Systems * This nut provides a loop for the attachment of a hook style single point sling * Installs in seconds and simply replaces the standard nut * Length of Pull: 11.5-Inch (fully collapsed), 12-Inch, 12.75-Inch, 13.5-Inch, 14.5-Inch, 15-Inch (fully extended)