Sarco has Dumoulin actions for $295 with M70-type safety and other goodies. Check out the Dumoulin website and be prepared to drool. I seem to recall seeing a photo of one of these that showed the C collar, but can't be sure. Like other actions offered in the white, these may require heat treatment. Ask before you buy.
The Domoulin Herstal Mauser action is not a C ring, it has the H cut and does not require heat treating.
