In my last post I talked about an early 1973 Daisy 880. That early rifle had a barrel without rifling.
Just a bit later Daisy came out with the 881 rifle, and that model did have a rifled barrel.
Here is a 1976 Daisy advertisement for the 881 that features a "ten sided rifled brass barrel".
I just received a 1979 Daisy 881 and was excited to examine the barrel. The barrel shroud announced "Rifled Barrel". But upon first inspection of the inner barrel I could not see any rifling! Then I noticed the whole rifle including the barrel was soaking in oil. So I took it apart and pulled some cloths through the barrel to dry it out and inspected again... I had to look very closely, but with a bore light and a magnifying glass the rifling became obvious!
I made a couple attempts to photograph the rifling. They are not great photos, but here they are:
The barrel of my 1979 rifle is steel and does appear to have rifling with 12 sides. I'm not sure, but this may be polygonal rifling?