True, and I've also had them look like rust buckets and go for a "song" and when cleaned up, amazing results. I just bought an old Pedersoli Bess from the Internet, with a browned lock and barrel. Bore looks good in the photos. We'll see how well I can get it back to proper condition for The King's Army!!
So you never know. One of the nice things about the military muskets from Japan or Italy is that even if the barrel is roached, the parts tend to be pretty good, so as long as you don't pay more for the parts sans barrel than they are worth, you're good, OR be sure you have an "inspection" period if you buy online....
LD