Is the magazine cutoff from the 1910 interchangeable with that of the 1905?
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Is the magazine cutoff from the 1910 interchangeable with that of the 1905?
No. mechanically completely different. The 1905 has a small arm inside the front of the trigger guard. Pulls down the follower and rounds. The 1910s cutoff is combined with the bolt stop, very much like the 1903 Springfield. It controls how far back the bolt can move.
To my surprise I learnt that even within the 1910 series you'll find differences in the magazine cutoff, speaking dimension-wise.
There are were 129 variances within the Mk. III alone...
Ross rifles were almost parallel manufacture.
As they said, "Sir Charles never made the same rifle twice ..."
Some Mk.III mags are made of much thinner and softer steel than others. From my old P&W gauge it dropped from 16 gauge down to 21; and it's not a tough 21 either!
A wartime economy or the previous material was unavailable?
Overall, the Mk.III mag was a design failure from the point of view of economy and maintenance. The lack of positive location on the underside of the receiver caused the deformation seen on the front edges; another design failure.
AFAIK, the reason for the change from the simple and reliable double stack of the Mk.II rifles is unknown, but may have been due to the Mk.III having been adapted to .303 from the intended .280 cartridge.
However, the .280 sporters on both the 1907* and 1910 actions use a simple and reliable double stack similar to the Mk.II rifles, so the mystery deepens!
* a term sometimes used for the action of the first .280 sporters which were similar to the Mk.II (1905) action, but had the interrupted thread bolt head later used on the Mk.III (1910) actions.
The early MkIII had the light weight thin soft Magazines. These were replaced by the heavier gauge early in production due to complaints about their fragility.
Factory Ross .303" sporters built on the MkIII action appear to have retained the light magazine.
The MkII cutoff lowered the ctg column below the bolt travel.
The MkIII cutoff limited the rear movement of the bolt preventing the bolt from picking up a ctg from the mag.