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I think that the volley sight provision is a strong argument. i tried using the volley sight on my 1905 and it seemed to be easier to use the sight with the swivels aligned to the right, especially since the volley sight gradations make the front sight swivel under the rifle for longer ranges.
Volley sights? LoC and Musketry instructions ,various dates, call them long range sights. I will continue to use British terminology like charger for "stripper clip".
It was because of the long range sights, NOT to ease carrying.
When those sights were made inop or deleted, they still made the swivels that way since there was no reason to rework the part, PLUS they had large quantitys of perfectly good spares which would have to be disposed of as well.