...snip...Long Branch, Toronto, by fitting a new barrel and extractor (1:34)..snip...
Just a couple minor clarification points-
Extractors may have been fitted, but they were .303 extractors, NOT 7.62 extractors.
Also most DCRA 7.62 rifles had new Long Branch bolts and bolt heads fitted, and all I've seen show many point hardness test impressions on various points of the bolt body, the locking lugs and the bolt heads.
Sometimes the technical proof marking on the receiver ring is located below the wood level and not visible until the forend of the rifle is removed.