Anzac15: Do you have any additional photos showing the left side receiver ring and barrel shank or the underside of the barrel? I wonder if, as opposed to being a "Kyhber Pass" it might be the victim of multiple conversions/ upgrades at Ishapore? The markings have some similarity to those of a CLLE Mk II I.P. They do seem to me to be rather strange markings for someone to put on a pure forgery. Just speculating because I always have trouble picturing somebody creating an action body with files and chunk of railroad track.

Ridolpho