What does CGB stand for?

[rob love]

On certain gun parts such as the Canadian sniper rifle telescopes, or the Canadian 22 Enfield rifle chests, or various Canadian Bofors parts, the letters CGB prefix some the part numbers. According to the Canadian Bofors Manual, the CGB refers to:CGB: a) parts re-designed to suit Canadian Production methods but not interchangeable with UK counterparts.
b) Also, in some cases, these part numbers have been utilized in regrouping stores to simplify accounting and storage. In such cases interchangeability will be readily appreciated by a comparison of columns 3 and 6.

So by this, we know what the letters mean, but what I would like to know is what they stand for. Does anybody know?

I note that on the bofors manual, any observations are to be sent to the Controller General Inspection Board of the UK and Canada. Could it be that CGB stands for Controller General Board?