The VTAC LUSA allows the shooter to select from four different attachment options in one product use a quick detach sling swivel, a conventional sling swivel, a hook or simply run the sling through the sling loop. This versatile product allows you to choose your favorite method without changing hardware. For armorers, the LUSA eliminates the need for four different sling attachment brackets. For shooters that utilize the quick detach sling swivel, the sling attachment is designed to lock in the swivel and limit rotation to 45 degrees.