I was a friend of Bill Kurns (now deceased) who made excellent barrels. He lived in Crystal Lake, Illinois and I visited his shop many times. He built several rifles including about a half-dozen Wender-action over-under flintlocks, all using his own barrels and locks. He was an excellent machinist and a good marksman. If this barrel has been taken care of over the years, it will be a tack-driver.