i have in my possesion a sweet little rifle, a 1964 marlin model 39 carbine 22. I recently attended a gun show when i met an older gentleman showing a model 39. As he was showing me his, i noticed his rifle was exacty like mine, except it had an octagonal barrel, while mine was a smoooth circle. when i told him of this difference, he told me the rifle never came in a smooth barrel. Him telling me this has bugged me ever since. Can anybody put my mind at ease?