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Ha ha ha....Not as sexy as the stories above, but CS stocks were found on Colt sporter carbines during the early 1990s leading up into the AWB. They were on configurations that were not especially sexy due to AWB features such as shaved bayonet lugs and pinned sear blocks. The CS stocks were removed from these rifles when converted to the evil collapsible stock. Turns out that many people like the shorter LOP and the Internet folklore of the Canadian SF connection.
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It's not internet folklore. The stocks were made for the Canadian Forces. When Canada had the C1A1 it was available with short, normal and long buttstocks. They decided to do the same when adopting the C7. Canada is bilingual to the extreme. To the point where the front sight only has an arrow, no up marking and the rear sight had no R for right, just the arrow.
Being pragmatic they adopted only two stocks, the short one is indeed marked CS for court/short as otherwise it would be indistinguishable from a regular A2 unless measured. The A2 was the default length and if longer was required there was a spacer that installed between the stock and the buttplate.
Now, I can't tell/explain how Colt ended up with so many extra that they put them on factory rifles but they exist because Canada wanted them for their new service rifle in the 80's. I asked the weapon tech to install one on my issued C7 when I realized how much nicer it felt compared to the standard length.