I think that the main issue is the dating of the gun, the older the gun type or style the less likely it would have survived into another era, a 1720 French fusil could have survived as shown by the surviving converions to caplock, a French fusil from 1755 would be more likely to have survived, also the number of a type of gun that were sent to the Americas is another factor to consider, and the geographic distribution of a style would infuence the chances of finding one at a particular time and place 50-60 years later, once again some research on the particular gun would be usefull in figuring the odds so to speak, but for the most part we are always told to use something earlier than or persona to be SAFE, in this case the French gun would be doable but would not likely look like it just came out of a packing crate, also a Maple stock, would be an indication that it had been restocked in the colonies, this type of situation does not have a right or wrong answer it is a matter of choice and interpretation of the available resources on these guns and their use and distribution I would not consider it to be off the wall but not a "common" thing either, but as stated above where one wishes to be on the curve is a deciding factor, there is no mandate for everyone to be in the midle of the curve this would eliminate the representation of 50% of the who, what and where of the time, it does bring with it the responsibility if asked(or even if complimented on ones gear)to explain the degree of commonality that one represents.