The change occured when the bolt operating was changed on the guns. Parts were reduced as well as method of bolt operation. Not sure of the year off the top of my head. Was it 1918?
There is much more wood in the later buttstock heads since there are less parts needed to open the bolt and since the hammers do not draw back as far.
Worse case, if you have a later one, but need an earlier one. You can remove the required wood from the later one to make it work.
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B. Dudley
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