We all know what a magazine cut-off is for, don't we?
Well someone on another forum has a seen a WO reference dated just before the Great War stating that the cut-off is NOT to be used to make the rifle into a single-shot!
Now all all know (we really do know this) that lots of Mk.III*s were "upgraded" to Mk.III between the wars. So bearing in mind the above - does anyone why? (Source references would help.)