There is an old stone house which belonged to one of the Feree gun makers, up on the hill west of Tarentum, PA. A few decades back there was quit a fuss to save it, when the road dept wanted to go through with a new freeway, more or less parallel to Rt 28 (I used to think 28, along the Allegheny, had the worst potholes in the world. Then I moved to Michigan . . . )
Anyway there was a Feree in western PA, think he made flintlocks. In one or the other major books. Maybe Rosenberg & Kaufmann, maybe Henry Kaufmann.