What rifle is this?

[cornstalk]

This belongs to a friend of mine. The only picture I have at the moment. Cap lock but looks like it might have been converted from a flintlock. 45 caliber. It is a full stock, long barrel, with a trigger and set trigger. No patch box. The stock does have a cheek piece and a butt plate. He believes it to have been handed down for numerous generations. The letters "AB" are on the top flat of the barrel which he says are the initials of a grandfather or great grand father or great great grandfather.

 

[HighUintas]

Definitely can't tell anything from that photo other than that it looks like it was likely converted from flintlock due to the front lock bolt hole and absence of bolt.

 

[necchi]

He believes it to have been handed down for numerous generations. The letters "AB" are on the top flat of the barrel which he says are the initials of a grandfather or great grand father or great great grandfather.

Honestly, it's tough to narrow down when there's a possible 5 generation spread confirmed with a 2 letter barrel stamp.
That of itself confirms a mystery of genealogy not the history of the rifle.

 

[longcruise]

I think it might be more likely any marks on the barrel would be the maker's.

 

[D.Summers]

I agree