Something that has cropped up as of late, is allegations of Darne R actions, marked with the Charlin name. The Charlin company went out of business in 1955, and the guns were produced by Darne from 1955 until 1965 when they were discontinued, along with the Darne P model.

I have been told of these, but, have never seen one. I have no reason to doubt it is possible.
Best,
Ted