On a Ruger Single Six .22 LR is there any special years that they came with a "Patridge sight". In one issue of the Blue Book it shows an older Single Six with the "Patridge sight" & to the best of my memory a 6 1/2 in. barrel. I know I saw the Hunter version of the Super Single Six with a bead Patridge sight about 2 years ago. I also think I recall seeing a Bisley Single Six with the Patridge. I guess my question is has that been a feature offered all along with limited production or was it only offered in certain years? I do like the sight picture they offer but finding one vs. the ramp seems quite hard to do ..............