Although not very powerful, these are also a favourite of mine and one of the most regular I get in to work on. I am not an expert on the history of them, the Cadet was introduced in 1945 and the Cadet Major the year I was born 1946. They are a solid well made rifle and I have enough parts now to make up four complete ones when I get the time. Of all the dozens I have worked on I have never seen a smooth bore barrel.
Baz