Development of this weapon began in the spring of 1908, and the planned designation was Rifle, Ross Mk III. This model was intended as a major improvement over the previous Rifle, Ross Mark II with Sight, Ross Mk III. The barrel length was extended to 30.5 inches, the rear hand-guard was simplified, the safety was replaced by a completely new flag-type safety, and the rear sight was changed to the third-party Sight, Sutherland Mk I. The magazine cut-off was dispensed with entirely. By the time it was ready to be produced in numbers, an even more radical design change was in the works to become the Mk III, and this model was designated Rifle, Ross Mk II** instead. In May 1909, it was decided to convert some 500 of the Rifle, Ross Mk II, with Sight, Ross Mk III to the new design for field trials. This was increased to 700. While these weapons were being trialed, production of the shorter "Mk II" continued, with some of the "Mk II**" changes being introduced. In 1911, the Rifle, Ross Mk II** became the standard Canadian issue, and production began. Some 13,000 were newly manufactured before this model was superseded by the Rifle, Ross Mk III in 1912.
