Q on Brit/Canada use of M1917's

[Too Much Coffee]

The question of a notch at the rear of the recvr. bbl. ring just above the mag well has come up. No one has a documented answer. They seem to have been milled, a half moon notch, some into the "M" stamp of "Model of 1917". These rifles seem to be re-imported back to the USA from Canada, Denmark, NZ possibly?

Do you "Limey" types have any "real" answers for this notch?????????

TIA
Mark

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