My guess would be the pistol was made by Jackie Brown, a prolific builder somewhere in north Alabama or southwest Tennessee. I know Jackie likes that “Tennessee” sideplate, the trigger with the pigtail curl, and on his smoothbores, a turtle front sight. I have a Jackie Brown fowling piece which has exactly the same sideplate, trigger, and front sight. Jackie called it a “Carolina smoothbore,” although it is quite different from the historic “Carolina guns” of the 18th century. I’ll need to pull it out and check, but I think mine has his first and last names engraved on the barrel. Maybe he only put his last name on your pistol because of limited space on the shorter barrel.
Your pistol has a Siler lock, which is one of the best.
Jackie is a very fast builder, and his work sometimes shows it. My long gun had a few minor issues I was able to manage myself. However, his workmanship overall is solid.
I don’t know if Jackie is still building, as he is getting up in years. People who own his guns tend to keep them, so even though he has probably built hundreds, I don’t see a lot of them up for sale.
In any event, I like that pistol a lot. It ought to be a good shooter, and a lot of fun. You have a keeper there, Bub.
Best regards,
Notchy Bob