US Patent 7988023 Adjustable gun sling

A gun sling for carrying a rifle or shotgun is adjustable to serve either as a bungee sling or a fixed-length, non-stretch sling. In a preferred embodiment this is realized with a flexible sheath forming a portion of the sling, with a bungee cord or stretchable strap inside the sheath. With the bungee relaxed the sheath forms a non-stretchable but flexible portion of the sling. When the bungee cord is stretched and tensioned, the sheath gathers and shortens so that the bungee provides for a desired length of stretch.