Based on your pictures, its a flint lock and old. Nice looking side plate and the stock is carved.
Help us out.
Are there any markings on the barrel?
How long is the barrel?
Is it loaded?
Does the barrel transition from octagon to round?
What is the approximate caliber?
Is it smoothbored or rifled? I don't see any rear sight or dovetail for a rear sight, so I would speculate that its a smoothbore.
Can we see a full length photograph from butt plate to muzzle?
Can we see a picture of the muzzle?
Can we see a picture of both sides of the butt stock?