Back in the day, when I wrote the Darne, Charlin, and Francisque Darne sections of the Gun Blue Book, I noted that most of the Francisque Darne guns were tinkered with versions of the 1894 Regis Darne patent.

Nothing has changed from that, in my opinion. Further, Id guess he got his unfinished but barreled and proofed actions from his Fathers companies back door.

Best,
Ted