Hi Rob, Although not correct for OP`s rifle. In the summer of 1913 the last 3000 Military MkII** rifles were fitted with the !912 (milled) charger guide and the screw elevating rearsight (Mk III).
The barrel mounted sight base was also removed and a one piece hand-guard installed. It got the North Over front sight hood as well.
I have a very nice one of these with the serial number very close to the one on pg. 175 of TRRS. This one is the same as what is stated above (ref. pg. 47 TRRS) whereas the one in the book has a strap style base with a CanadaTool and Specialty Co. sight.