It's kind of hard to say from the pictures, but it looks to me that the barrels bear the "canons Fanget" mark, which means that the barrels were made by Fanget who was a good barrel maker. Perhaps not as well known as "Jean Breuil" but good nonetheless.
He did *not* make the gun.
I like the bulbous fences of belgian influence. You can see that they have been trimmed to a bear minimum in order to meet the weight goal.
Best regards,
WC-