David mentions in his book that there are two types of rifle valises: one that goes out the door with the jumper and another less padded one for putting inside the drop container. The valise that goes with the jumper has a pouch on its side to hold the rope for lowering the rifle before landing as does yours suggesting your valise is the former, not the latter. I've attached a couple of pictures from his book showing the general layout of the valise and its hardware for your perusal. Interestingly the muzzle of the rifle protrudes downwards while the valise is attached to the jumper but rotates 180 degrees after being lowered to allow the butt of the rifle to strike first. Is there a date of manufacture on your valise? It looks slightly different and longer than the ones in the book.