Looks modern and home made to me. The grain through the grip would normally have been selected to follow the curve, its not hard to do and would give strength.
The plate on the left side does not look right, it seems too long.
The screw to hold the barrel on seems strange.
The shine on the metalwork seems too much, could be picture quality but I would have expected a greyer finish.
The hex barrel looks too short. Is there a ramrod hole?
The decoration on the lock confuses, it could be a commercial lock. If it was an original and they bothered to put a bit of decoration on then I think a makers name would also be there.
Are there any marks at all on the barrel? A proof mark would be normal even a makers "mark".
“If a cricketer, for instance, suddenly decided to go into a school and batter a lot of people to death with a cricket bat, which he could do very easily, I mean, are you going to ban cricket bats?” :- Prince Philip said after Dunblane