That rifle was probably issued to the Otago Mounted Rifles as they were one of the first to get No1 Mk1. The Mk III rear sight will fit, although as Grandpamac has mentioned, they were originally sighted for the Mk VI ammo and the base, though similar, has a different elevation cam. Many were converted to the Mk VII sights after WW1. The original rear sight slide had ivory release buttons and the blade was adjustable for windage.
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