picked up M1917 today

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Safety stamps

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9-18 barrel stamps

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R marked front sight base

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So is this a C around the broad arrow if so this would be Canadian lend lease right.

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Import marks

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Rack number

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Stock cartouches on bottom in front of palm swell

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Stock cartouche on right side of stock

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Action screws still staked in

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So questions
Am I right that this was Canadian Lend Lease
If action screws still staked was that done at factory or in field
Did Canadians put white paint on M1917's and what did that represent
What's the proof mark in the 5th picture I posted, its also on stock and safety.

Thanks much.