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I believe that protrusion on the rear is for mounting the butt stock to make it a carbine using a large (30/40 rounds) capacity magazine. Some of the original holsters were wood and mounted as a butt stock. neat stuff. C&Rsenal has a youtube vid about them https://www.youtube.com/watch?v=hRAupWi5IcI&index=24&list=PLJvsSlrbdhn5v8AuvAZuOYJ5BgEEoDdqm |
















