It's not difficult to find photos of Musslini's Guardie Del Duce and see the carrying straps on their carcanos.
Denis 1
Walt 0
The straps and support of the USAF M13 Leather Sling and Oswald's sling are the same length, shape and size, the buckles are the same, the connecting hoops are in the same place, the type of leather appears the same, the studs are the same, the rivets are the same, the amount of studs/rivets is the same and the placement of the studs/rivets is in the same place.
Btw post some photos of an alternate sling and let's see how similar they are?
JohnM