I don't have any of the documentation I found for this anymore but when I looked in to this a few years ago I found a lot of information indicating that they were contract guns built to a higher standard, as speculated here.
That wouldn't surprise me; locally we see a fair number of contract Stags in LE ERT usage that are on par with a 6920. A couple of years before "the chart" existed and rifle tiers were common knowledge, I recall contract Stags being issued in a municipality close to here with the full meal deal...1:7 4150, HP/MPI, etc, etc.
There are a lot of companies that COULD build a perfectly good clone of a 6920 if that was what they really wanted to do. Unfortunately, there's also plenty of money to be made doing stuff you know isn't as good, and lots of companies use that business model instead.
Full disclosure: I'm the editor of Calibre Magazine, which is Canada's gun magazine. In the past I've done consulting work for different manufacturers and OEM suppliers, but not currently. M4C's disclosure policy doesn't seem to cover me but we do have advertisers, although I don't handle that side of things and in general I do not know who is paying us at any given time.
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