The Picatinny Rail Bipod Adapter /Sling Adapter allows the mounting of a Harris-type bipod or ATK folding bipod to rifles equipped with Picatinny or quad rails or a sling. Constructed of hard anodized aircraft grade aluminum and steel. Also doubles as a sling swivel stud for quad rails. Comes with mounting tool. Fits handguards with a Picatinny or Weaver rail.