I have 2 Nylon 66's they are semi auto tube fed 22 lr's. MIne were bought in the late 70's, one is a "black diamond" and the other is a "white diamond" I have seen one at a show that was clip fed. They are a great light weight little 22 that is fun to shoot. The black diamond has a black stock and black diamond, the white diamond has a brown stock with a white diamond. Im not selling mine, just thought Id try to explain about them.