The swivel is kept in place by a four ball detents connected to the push button, which presses against the walls of the socket.
A variation of the single point sling is used in precision target rifle shooting from the prone position.
For a right-handed shooter, the sling attaches to the top of the left arm, and clips onto the forend of the rifle.
The sling with upper and lower arm form three sides of a triangle that provide a steady support for the rifle.
An example is the affusto d'assalto (assault carriage) that was devised by the 139° e 140° Reggimento Fanteria Brigata "Bari" in 1917 and used on the Villar Perosa aircraft submachine gun.