There's lots to unpack in Mr. Edgecombe's book's chapter on Martini-Henrys. On p.74 he states that 1,700 of the 5,000 MkIII's were "in possession of Corps, on loan under bond. The supply of MkIII rifles is exhausted and it may be necessary to withdraw some of those now on loan to Corps in order to complete the arming of garrison artillery". So now the question is which units of the "Corps" had MkIII M-H in their possession so as to be able to arm the garrison artillery units. At least one unit is named in the book: The Montreal based 6th Fusiliers of Canadaicon. Further complicating the identification of the various units possessing the M-H's on loan was that they were not to be marked or defaced in any manner although it is possible that some received unit markings.