CRB on Ross M10 - What does it mean?

transitsc

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SW Ontario
Just currious, but what exactly does CRB mean that is stamped into the receiver ring of some Ross M10's.

I've read it could mean one of three things:

1) Canadian Railway Battalion
2) Canadian Ranger Battalion
3) Canadian Reserve Battalion

Can anyone shed some light on this?
 
There was also a Canadian Railway Brigade working hard on the Western front, bringing all that ammo up to the boys on their little 2-foot-gauge railways. I would think this more likely.
 
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