I've got an H&R .58 muzzleloader that I bought when I was a teen in 1976. Purchased it at Jackson's Gun Shop... the hole in the wall shop that was on the exterior/south end of the then-Northwood Mall. It pretty much looks just like every other H&R single shot out there.

I'd bet someone picks up the line under another brand name, unless it's just not profitable to make them. It's hard for me to see how they wouldn't be profitable, though, if Mossberg and Marlin can sell their entry level bolt action rifles for not much more than these H&R single shot rifles.