The Viking Tactics L.U.S.A. Sling Attachment allows the shooter to select from four different attaching options. With the Viking Sling Attacment you can use a quick detach sling swivel, a conventional sling swivel, a hook, or simply run the sling through the sling loop. The VTAC-LUSA. allows a wide variety of options without changing hardware. For armorers the VTAC-LUSA eliminates the need to stock four different sling attachment brackets. For shooters that use the quick detach sling swivel, the VTAC Sling Attachment is designed to lock in the swivel and limit rotation to 45 degrees.