The KAC KeyMod(TM) Sling Hook Assembly was designed for shooters who run a single point sling. When both hands are required for non-gun-related tasks, the user may snag a portion of the sling with the hook, drawing the rifle s forend snugly to the side of the body instead of dropping the gun to bounce freely between the legs. It attaches quickly and securely to the URX 4 rail or any other rifle handguard that has a KeyMod interface. Aluminum construction.