Comments:
Appears to be a recent reconversion to flint of English Indian Trade Gun.
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To my eye, this is a classic Northeast gun, made somewhere in New England, probably in MA. It almost certainly dates to the third, or last, quarter of the 1700s and it compares closely with the Abner Howe, 1776 gun, which is already in the Library. These pieces bear no marks, signatures, or proof marks anywhere, which suggests deliberate anonymity.
It may well be that the lock has been reconverted since it seems to have some anomalous features, and if so, perhaps it could be redone for a better appearance. Otherwise, this is a far better than average example of a New England fowling gun, in my opinion.