Nice piece, but..
The buttplateand side plate are more military looking than seen on a fdc.its not carved as seen on intact guns the one photo shows what looks like remains of a forestock molding. Not on a fdc.
St. Etienne only started producing Fdc's after tulle could not fulfill the contracts, mid 1740s
A fusil ordinaire, maybe.
I'd bet money more of a period restock.
Also unless I missed something, caliber would dictate a few things also..
That all being said,I'm forwarding it to Kevin as hes probably seen every French gun in Canada.