The long box magazine looks like a Vetterli-Vitalli 1878/87/15 conversion to 6.5x52 Carcano as WWI substitute standard.
The article at
describes the rifle and its background.
They do not consider it safe to shoot with accounts of separation of the barrel liners or bolt heads and setback of the small locking lugs that were adequate for 10.4mm black powder.
They sure didn't make any lefthanded infantry rifles in those days.
How do you inadvertently flip a digital image? Not uncommon in the film era and quite common in the glass plate and tintype processes, but now?