Genuine DCRA conversions as done by Canadian Arsenals Limited will have the serial number on the receiver ring and on the bolt handle. As BAR says, the mags and extractors were standard .303 as the rifles were intended for competition which only required single loading anyhow. Original serial numbers were not altered. The pictured rifle in post #3 appears to me to have been built later by someone using a serial number scrubbed spare receiver which were common in Canada. I agree with Maxwell Smart about the magazine. Numrich Arms sells reproduction 2A/2A1 mags that look just like the originals and function well. The finish on repros is better than the originals.
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Almost forgot: They will also sport the tri-cornered Canadian Technical services proof on both the receiver and bolt handle.
---------- Post added at 10:15 AM ---------- Previous post was at 10:14 AM ----------
"tri-cornered maple leaf". Need more coffee!